Even before being on the soundtrack, "Supermassive Black Hole" from Muse was an awesome song and now it is even cooler. I also love the the Linkin Park track, "Leave Out All the Rest." Collective Soul is a '90s classic, so of course I love any of their songs. I am still trying to decide if I like the tracks by Rob Pattinson (aka Edward Cullen). His voice reminds me of a very slurred Damien Rice or Jeff Buckley. I'm having a hard time understanding the lyrics, but I think once I do figure out what he's singing, I'll like the songs ("Never Think" and "Let Me Sign") a whole lot more.
And, for the record, I am in love with Paramore. I think Hayley Williams' voice is so hauntingly beautiful (similar to Evanescence's Amy Lee's voice). And their music is just plain awesome. I mean, songs don't really get any more rock-out-like-crazy amazing than "Misery Business." Both of the songs that they contributed to the soundtrack ("Decode" and "I Caught Myself") are great.