Just fell over this little gem, a open source version of Guitar Hero. It can even import the tracks from GH1 and GH2 if you own the CDs, and it can use the PS2 controller if you prefer to use that

You can get the game itself here:
http://fretsonfire.sourceforge.net/
And for a shitload of songs (including the GH1 and GH2 songs, and XBox Exclusive ones):
http://wiki.hellmark.org/Frets_on_Fire_Song_List
Go download and play today, its fun. And as a side note, i suck, i can 5 star SOME songs on the very easy mode, but after that i just suck. Or i need more training, never played a guitar, and generally suck at music, so need training
