errmmm...
Well, my favorites are Emarosa, Margot & The Nuclear So and So's, Mayday Parade, and Say Anything.
Other than that...alphabetically:
All Time Low, Alphabeat, Always Rushing By, Arcade Fire, Architecture in Helsinki, Ariel Pink's Haunted Graffiti, The Battle of Land and Sea, Beirut, Belle & Sebastian, Beulah, The Blow, Bright Eyes, Camera Obscura, Cap'n Jazz, Casiotone for the Painfully Alone, Cassette Kids, Clap Your Hands Say Yeah, Coconut Records, Cursive, Dance Gavin Dance, A Day To Remember, Death Cab for Cutie (mostly old stuff), Eisley, El Oso, Elliott Smith, Family Force 5, Frightened Rabbit, From Autumn to Ashes, Girl Talk, Good Luck, Gravy Train!!!!, Gregory and the Hawk, Hot Chip, The Jackson 5, Jim Guthrie, The Last Shadow Puppets, Lights, Lydia, M.I.A., MGMT, The Mountain Goats, The Movielife, Muse, Neutral Milk Hotel, New Kids on the Block, Park Ave. Pierce the Veil, Placebo, The Postal Service, Saves the Day, Set Your Goals, She & Him, Silverstein, A Skylit Drive, Sleater-Kinney, Sneaker Pimps, Something Corporate, The Thermals, Thomas Dolby, Tilly and the Wall, Tom Waits, Weezer, Wolf Parade, Xiu Xiu, Yeah Yeah Yeahs, 3OH!3, !!!
Blue October
Linkin Park
Lily Allen
The Ting Tings
Lady Sovereign
No Doubt
Lenka
The Veronicas
Regina Spektor
The New Young Pony Club
Yael Naim
Lady Gaga
Kylie Minogue
3OH!3
Feist
The Killers
Stereo Total
Evanescence
Daughtry
The White Stripes
