Not that installing from source is difficult, but I try to find a repository for apps if I can. Apt/Synaptic is what makes Debian so great. I run Debian Sid with a couple of bug fixes from sidux.
So here a rather complete sources.list . Please share yours, especially if you have any apps not in the repos listed below.
Any questions about installing certain things like wireless, video drivers, etc please look through the Debian wiki at
http://wiki.debian.org
A few notes
Make sure you do not have any non-us repositories listed as they were made obsolete when Sarge became stable.
Sun's Java is now in the Official Debian Unstable non-free repo.
The AMD-64 repositories from Debian are now in the normal Sid repos.
Adobe Flash is in non-free for testing/sid use backports.org for stable.
If you want the non-free nvidia/ati drivers you need contrib non-free.
This list covers Stable, Testing and Sid please use only the repos that apply to your release. Please do not mix releases unless you know what you are doing and use apt-pinning if you choose to do so. This list covers pretty much everything including the kitchen sink, only use repos that you trust and uses as few as you need, especially when doing an apt-get upgrade or apt-get dist-upgrade. Also do not mix the use of aptitude and apt, pick one and stick with it.
# /etc/apt/sources.list
############
## Sid ####
###########
#####(My Debian Sid sources.list)###########
# Unstable Sid
deb
http://http.us.debian.org/debian/ unstable main contrib non-free
# Unstable Sources
deb-src
http://http.us.debian.org/debian/ unstable main contrib non-free
# sidux
http://sidux.com/files/misc/sources.list
deb
http://sidux.com/debian/ sid main contrib non-free firmware fix.main fix.contrib fix.non-free
deb-src
http://sidux.com/debian/ sid main contrib non-free firmware fix.main
fix.contrib fix.non-free
##
http://www.liquorix.net/ The configuration is optimized for a practical desktop experience. run smxi you will see the option to install liquorix kernels in advanced kernel install options.
apt-get update && apt-get install '^liquorix-([^-]+-)?keyring.?'
#deb
http://liquorix.net/debian/ sid main
#xadras sidux repo -siduxcc, autostart,sidux-kio,klamp,
#kding,kirocker,kio-sysinfo
#
http://xadras.wordpress.com/downloads/
# Secure apt install xadras-keyring
#deb
http://sidux.wuertz.org sid main
#deb-src
http://sidux.wuertz.org sid main
# Cathbards sidux/Debian artwork repo
#
http://www.cathbard.com/
# deb
ftp://cathbard.com/ ./
# Marillat For info visit
http://www.debian-multimedia.org
# Unstable
deb
http://www.debian-multimedia.org sid main
#deb-src
http://www.debian-multimedia.org sid main
# Experimental Staging
# deb
http://www.debian-multimedia.org experimental main
# Marillat Mirror
# deb
http://debian.three-dimensional.net/debian-multimedia/ unstable main
# deb-src
http://debian.three-dimensional.net/debian-multimedia/ unstable mainn
############### End Sid sources.list ##################
## Debian Eee PC
http://wiki.debian.org/DebianEeePC/Repository
# Testing
#deb
http://eeepc.debian.net/debian lenny main contrib non-free
#deb-src
http://eeepc.debian.net/debian lenny main contrib non-free
# Unstable
#deb
http://eeepc.debian.net/debian sid main contrib non-free
#deb-src
http://eeepc.debian.net/debian sid main contrib non-free
##################
## Experimental ##
##################
# Debian experimental
#deb
http://ftp.debian.org/debian/ experimental main contrib non-free
# Debian experimental kernels #
# deb
http://kernel-archive.buildserver.net/debian-kernel/ trunk main
#######################
## Multi-media Repos ##
#######################
# RareWares/Debian Multi-Media Repository for Unstable
# Info
http://www.rarewares.org/debian.html
#deb
http://www.rarewares.org/debian/packages/unstable/ ./
# RareWares/Debian Multi-Media Repository for Unstable - Experimental Staging
#deb
http://www.rarewares.org/debian/packages/experimental/ ./
#VLC's latest packaged version is always in the official Debian unstable branch. #However you should still use our apt-get line if you need libdvdcss:
# deb
http://download.videolan.org/pub/videolan/debian sid main
# deb-src
http://download.videolan.org/pub/videolan/debian sid main
#Vlc [nightly builds], add:
#deb
http://nightlies.videolan.org/build/sid-i386/arch ./ , to #/etc/apt/sources.list [/sid-amd64/ for 64-bit]; then: gpg --keyserver #wwwkeys.eu.pgp.net --recv-keys AA5F4DE6 && apt-key add /root/.gnupg/pubring.gpg
# My Media System
http://mymediasystem.org/
# deb
http://www.prodeia.de/mms/sid binary/
# deb-src
http://www.prodeia.de/mms source/
# Tovid
http://tovid.wikia.com/wiki/Installing_tovid/Debian
# deb
http://tovid.sourceforge.net/download/debian unstable contrib
# deb-src
http://tovid.sourceforge.net/download/debian unstable contrib
# Freevo
#
http://doc.freevo.org/FreevoAptDebian
# deb
http://freevo.sourceforge.net/debian unstable main
# cinepaint
http://www.cinepaint.org/
# deb
http://sidux.net/etorix/i386 ./ [or /amd64 for 64-bit]
#Cinerella
#
http://cinelerra.org/getting_cinelerra.php#apt
#x86 Debian packages are built from SVN by Andraz Tori,
#To install the package add this line to your sources list:
#For i386 processors:
deb
http://www.kiberpipa.org/~minmax/cinelerra/builds/sid/ ./
#For Pentium4 processors:
deb
http://www.kiberpipa.org/~minmax/cin...ilds/pentium4/ ./
#For Athlon processors:
deb
http://www.kiberpipa.org/~minmax/cin...ilds/athlonxp/ ./
# Apt-source:
deb-src
http://www.kiberpipa.org/~minmax/cinelerra/builds/sid/ ./
#AMD64 Debian packages are built from SVN by Valentina Messeri.
#To install the package add this line to your sources list:
deb
http://giss.tv/~vale/debian64 ./
#Apt-source:
deb-src
http://giss.tv/~vale/debian64 ./
############################
## Debian Testing/Squeeze ##
############################
# Testing
#deb
http://ftp.debian.org/debian/ testing main contrib non-free
#deb-src
http://ftp.debian.org/debian/ testing main contrib non-free
#Testing Security updates
#deb
http://security.debian.org/ testing/updates main contrib
#deb-src
http://security.debian.org/ testing/updates main contrib
# Debian Volatile
http://www.debian.org/volatile/
# deb
http://volatile.debian.org/debian-volatile squeeze/volatile main contrib non-free
###################
## Stable Lenny ####
###################
#Stable
#deb
http://http.us.debian.org/debian/ lenny main contrib non-free
#Stable Sources
#deb-src
http://http.us.debian.org/debian/ lenny main contrib non-free
#Security Updates Stable
#deb
http://security.debian.org/ lenny/updates main contrib non-free
# Lenny and a Half
http://wiki.debian.org/LennyAndAHalf
# deb
ftp://ftp.debian.org/debian lenny-proposed-updates main
# Debian Stable Backports
# For information visit
#
http://www.backports.org/dokuwiki/do...d=instructions
# apt-get install debian-backports-keyring
#deb
http://www.backports.org/debian lenny-backports main contrib non-free
# Debian Volatile
http://www.debian.org/volatile/
# deb
http://volatile.debian.org/debian-volatile lenny/volatile main contrib non-free
# Marillat For info visit
http://www.debian-multimedia.org
#deb
http://www.debian-multimedia.org lenny main
#deb-src
http://www.debian-multimedia.org lenny main
# Kde4 for Lenny
http://debian-desktop.org/doku.php/start
# The repository for Debian-based LAMP servers Look in backports.org first!!!
#
http://www.dotdeb.org/
#deb
http://packages.dotdeb.org stable all
#deb-src
http://packages.dotdeb.org stable all
######### End of suggested Stable repos ###########
########################
### EXTERNAL SOURCES ###
########################
## Desktops ###
# Debian's XFCE Group
http://pkg-xfce.alioth.debian.org/
# LXDE
http://www.lxde.org
# Most of LXDE is in the normal Debian Repos
# deb
http://people.linux.org.tw/~andrew/debian/lxde/ ./
# ROX Desktop
# For info see:
http://rox.sourceforge.net/desktop/node/86
# deb
ftp://ftp.berlios.de/pub/rox4debian binary/
# Enlightenment E17
#
http://xsm.alphagemini.org/E17/repository/index.html
#gpg
http://debian.alphagemini.org/dists/....05.07_all.deb
# deb
http://debian.alphagemini.org/ unstable main
## Web Browsers ###
# The Opera Web Browser Official packages.
# For gpg see
http://deb.opera.com/
# Etch/Sid packages are available:
http://www.opera.com/
### Example apt source configuration (uncomment the version you want)
# Opera Browser - Production release
#deb
http://deb.opera.com/opera/ stable non-free
#deb
http://deb.opera.com/opera/ testing non-free
#deb
http://deb.opera.com/opera/ unstable non-free
# Opera Browser - Beta release
#deb
http://deb.opera.com/opera-beta/ stable non-free
#deb
http://deb.opera.com/opera-beta/ testing non-free
#deb
http://deb.opera.com/opera-beta/ unstable non-free
# swiftfox
http://www.getswiftfox.com/index.htm
#deb
http://getswiftfox.com/builds/debian unstable non-free
### Miscellaneous ###
### WINE
http://www.winehq.org/download/deblenny
#Add this for Lenny: deb
http://www.lamaresh.net/apt lenny main
#Add this line for Squeeze: deb
http://www.lamaresh.net/apt squeeze main
#Add this line for Sid: deb
http://www.lamaresh.net/apt sid main
#wget -O -
http://www.lamaresh.net/apt/key.gpg | apt-key add -
# moblock, mobloquer
http://moblock-deb.sourceforge.net
#gpg --keyserver wwwkeys.eu.pgp.net --recv 9072870B
#gpg --export --armor 9072870B | sudo apt-key add -
# deb
http://moblock-deb.sourceforge.net/debian sid main
# deb-src
http://moblock-deb.sourceforge.net/debian sid main
# Google software repository contains Chrome, Picasa, Google Desktop
http://www.google.com/linuxrepositories/apt.html
#(wget -q -O -
https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - )
# or (gpg --keyserver subkeys.pgp.net --recv A040830F7FAC5991 && gpg --export --armor A040830F7FAC5991 | sudo apt-key add - )
# deb
http://dl.google.com/linux/deb/ stable non-free
# Google testing repository
#deb
http://dl.google.com/linux/deb/ testing non-free
# Official site for latest version of Skype. works with stable/testing/sid
# deb
http://download.skype.com/linux/repos/debian/ stable non-free
# Second Life apt-get install omvviewer
#
http://www.byteme.org.uk/secondlife-...econdlife.html
#deb
http://apt.byteme.org.uk/apt/ unstable main
#deb-src
http://apt.byteme.org.uk/apt/ unstable main
# Testing versions
#deb
http://apt.byteme.org.uk experimental main
#deb-src
http://apt.byteme.org.uk experimental main
# Tor
http://wiki.noreply.org/noreply/TheO...er/TorOnDebian
# Stable
#deb
http://mirror.noreply.org/pub/tor sid main
#deb-src
http://mirror.noreply.org/pub/tor sid main
# Experimental
#deb
http://mirror.noreply.org/pub/tor experimental-0.2.1.x-sid main
#deb-src
http://mirror.noreply.org/pub/tor experimental-0.2.1.x-sid main