Ubuntu software packaging system can accumulate unused packages or temporary files. These temporary files, also called caches, contain package files from all of the packages that you have ever installed. Eventually, this cache can grow quite large. Removing them allows you to reclaim space on your computer's hard drive for storing your documents, music, photographs, or other files.

To clear the cache you can use either the clean or the autoclean op for a command-line program called...

To convert web-pages into PDF file in ubuntu 10.10 is very easy way.
just press Ctrl and P and you will see a new box called Print.
In that you will see Print to file in printer section.
Now just press Print to file now you can see Name box and Output Formate
first you have select (.) PDF and and now you move to Name place and give and name to that file Exp:- xxx.pdf and now go to save in folder: place just press it to change to save on desktop. And press Print box....

About Cairo Dock
It uses Cairo / OpenGL to render graphics (many in correlation with Compiz) with full hardware acceleration. It's fully configurable and fully customisable and can be used as a taskbar too. You can easily add applets in the dock or as a desklet. It is recommended to install the PLUG-INS package (cairo-dock-plug-ins) to have acces to more views, dialogs and many plug-ins and applets. Some screenshots are available : http://pics.glx-dock.org This package is the core of Cairo-Dock...

What Is Docky?
Docky is an advanced shortcut bar that sits at the bottom, top, and/or sides of your screen. It provides easy access to some of the files, folders, and applications on your computer, displays which applications are currently running, holds windows in their minimised state, and more.

To install Docky from a terminal, use the commands below

sudo add-apt-repository ppa:docky-core/ppa
sudo apt-get update
sudo apt-get install docky...

What is Skype:-

Skype is a little piece of software that lets you make free calls to anyone else on Skype, anywhere in the world. And even though the calls are free, they are really excellent quality.

Make free Skype-to-Skype calls to anyone else, anywhere in the world. Call phones and mobiles at pretty cheap rates per minute. Group chat with up to 100 people or conference call with up to nine others. Free to download.

How to install Command Line Way...