I know, it's no Lady Ga Ga (http://www.nowpublic.com/culture/lollapalooza-2010-headliners-lady-gaga-green-day-soundgarden), but...
Pavement, LCD Soundsystem, Modest Mouse, St Vincent, Raekwon...so far, not too bad (http://www.pitchforkmusicfestival.com/index.php?d=all).