I was there! Here's who I saw:
FRIDAY:
Manchester Orchestra
White Lies
Kevin Devine
Ben Folds
The Decemberists
Crystal Castles
Depeche Mode
Also caught a little bit of Fleet Foxes, Of Montreal, and Zap Mama while walking around.
SATURDAY:
Ida Maria
Chairlift
Coheed and Cambria
Glasvegas
Rise Against
Yeah Yeah Yeahs
Also, a little Living Things, Miike Snow, Atmosphere, and Animal Collective.
SUNDAY:
Bat for Lashes
Airborne Toxic Event
Raveonettes
Vampire Weekend
Cold War Kids
Snoop Dogg
Silversun Pickups
The Killers
Also saw some Ra Ra Riot, Dan Deacon, and Passion Pit in there.