Save Ferris - come on eileen
Letters to Cleo - ever seen 10 things I hate about you?
Sixpence None the Richer - easy rock band
Stalking Roxy - Ska band
Tsunami Bomb - Pirate punk
Wir sind Helden - German band
Tricot Machine - French band
Evanescence - Can't believe nobodies mentioned them yet
The Veronicas - don't like them, but fits the op's question
Highball Holiday - another ska band
Squirrel Nut Zipper - Big Band Swing
Vera Lynn - best vocalist/most influential female singer ever.
Suspect Bill
Ocean 11
Checkered Cabs
Hermes House Band - Que sera sera, I will survive, etc.
Kinky coo coos
The Pepper Pots
Tip the Van
Sonic Boom Six - Skacore
Dance Hall Crashers - Pop Rock
Radiation Kings - 1950's swing/reggae cross
Oreskaband - Japanese ska band
Half Past Two - 1990's punk band
Chase Long Beach - maybe my new favorite band
http://www.youtube.com/watch?v=RI-QHCoXbaY
Flight 180 - sounds kinda like The W's
The Heat Machine (AKA The Incredible Heat Machine) - kinda like save ferris
2nd Time Lucky - popska
Prague Ska Conspiracy - Czech ska band
Blue King Brown - sorta like No Doubt
Skasmopoliton
Dr. Octopus - australian band, early punk type band
Skapoint - super secret government band
The Penguin Skazz
Rubix Cuba - latina band
Chupaskabra - Florida band, good singer
The Selector - kinda like the Clash
The Bohunks - LA based band
Brite Spot Collective
The Elixxirs - Canada based ska/punk band
Karmacanix - British Columbia band
Los Furios
Mobtown
The Pressure Sounds - new improved version of the Checkered Cabs
The Fabulous Rudies
Seven O'clock Scandal
Five Star Affair
ABBA - how haven't they been mentioned?
The Barrymores - sounds a lot like the Misfits
The Local Skank - all female ska band www.thelocalskank.com
Not from Concentrate
Rude Zombie - a lot like Goldfinger (back in the Tony Hawk Pro Skater days)
Berry Roll - Japanese Punk band
Browny Circus - yet another japanese band
The Soviettes - Minnesota based punk band
The Distillers - girl fronted punk band
The Epoxies - Kinda have a new retro sound to them
The Devotchkas - almost sound like the Casualties
Horrorpops - pop punk, but good - actually, I like them alot
X-Ray Spex - UK based band
Bikini Kill - punkcore band
Lost Cherrees - The vines like almost
The Eyeliners - girl based punk band
Go Betty Go - harder sounding Letters to Cleo type, pretty good
The Messengers - kinda like the Distillers, but not as assaulting singing
Lunachicks - might have been mentioned before
Detestation - I'm sure the metal loving escapists will appreciate them
Vice Squad - Dark rock, 1980's sound
Anti-Product - screamo?
Honeycreeper - ummh, don't know what to make of them
Witch Hunt - Hard Rock? Not bad in my opinion
Contravene - yeah.
Jellyroll Rockheads - ummh, yeah another screamotype
Bodysnatchers - rockeasy
Melt Banana - Heavy Rock
The Slits - 1980's
Blondie - deserves a mention
The Fabulous Stains - movie band like spinal tap
The Runaways - heat maybe?
Sonic Youth - might have been mentioned before
F-Minus
One True Thing - rock, very good singer
Zolof the Rock and Roll Destroyer - best name ever
Ley Royal Scam - Letters to Cleo influence evident, not bad though
The Avengers
Angry Amputee - sounds sorta like the Distillers
Dresden Dolls - BEST FEMALE VOCALIST I'VE HEARD
The Rondelles - rock easy, dead now
Sahara Hotnights - different to say the least
Hang on the Box - weird japanese band
Malignus Youth
Naked Agression
Ashtray - fun band
The Plasmatics - very odd band
Sleater Kinney - good, can't put them in a genre
Erase Errata
ChumbaWumba
t.A.T.u - hasn't been mentioned yet? weird
Well, I think that's enough to keep you occupied for a while, cheers!