For me, last year and 2003 were pretty damn good, and 2004 had a fantastic Flaming Lips show that made up for the rest of the event being dull.
This year looks completely missable. Violent Femmes I've seen a dozen times, they'll put on a good show, and the crowd will love 'em, but I'm bored of hearing that album over and over again. I hate Muse. I appreciate Tool, but I'm not a fan. The Killers have some good tunes, but the tapes I've seen of their live shows look dull, and the singer was tunelessly awful at Glastonbury.
So nothing for me, I'm afraid. But then I'm waaay too old to be the target audience, anyway.