On it, they have previews of all the songs from the release along with the video for their new single, Nine Lives. At first listen, I like about half of them. But that's no unusual for me. More often than not, I tend to like songs the more I listen to them.
They also have a Guitar Hero III contest you can enter to win some prizes, I assume to commemorate the release of three of their songs on Guitar Hero III: Nine Lives, along with two live (older "classic" tracks) Photograph and Rock of Ages.
The general consensus on the Guitar Hero III forums is that the quality is crap. I downloaded the songs and I have to agree. The instruments on the two lives tracks are a little difficult to hear and the volume on Nine Lives seems to increased and decrease at various times during the song. I don't know what Activision did to the songs, but I know they don't sound that bad.