The only song I've been able to figure out anything to is Astronaut, where the camera angles were (thankfully) enough to see her hands playing throughout enough of the song to figure out the whole thing. I'm confident enough in these chords that I posted them (and the sheet music) on the Yahoo! group, but I'd like some confirmation if anybody has perfect pitch.
Hook: bassline is D E F G, right hand is A the whole way through plus a high F, E, C, B
First verse: I'm about 90-95% sure it starts out F G C/A, and about 75-85% sure it then goes to F G and either A or C/A again, and 100% sure it loops between the two.
Subsequent verses: F G A, F G A, etc etc
Chorus: F A G (lol... hidden message?), F A G, F A G, etc etc until you get to the end and it's F C Bb
...And everything else is basically a duplicate of those four riffs. If someone with perfect pitch could make sure my first verse is right I'd be eternally thankful... I'm quite sure everything else is right or close enough to right not to make much of a difference.