Well, you've certainly got the desire.
First thing first, check out DistroWatch
; they list almost every Linux distribution available as well as reviews and comments about each one. You'll probably want to check out Fedora
, or SUSE
for your first romp with Linux. All are good distros for beginners (especially Mandrake) that will hold your hand enough to ease your move from Windows to Linux. Don't be afraid to explore or get down and dirty; you can only learn from making mistakes and it's better to make them, found out why, and figure out how to fix them than to sit back and want Linux to be just like Windows. Things are different here, but that's not a bad thing.
So after running with one of the three distros above, many new Linux users check out other distros, such as Slackware
(my favorite), Gentoo
, or Debian
. These offer a little more in complexity but can be extremely satisfying.
For software to replace what you've been using in Windows:
Microsoft Office -> OpenOffice.org
Winamp -> XMMS
Nero (CD burning) -> K3b
Photoshop -> The GIMP
Windows Media Player, QuickTime, RealPlayer -> MPlayer
There are a host of other apps out there as well. Check out Freashmeat
Any questions you might have or that might come up, LinuxQuestions is the right place.
Another good site for beginners is LinuxBeginners
Finally, welcome to Linux. You've taken the first step by showing your curiousity and asking questions. Now anything will be possible.