[Killua]

Here's what I'm currently listening to the most (artist - album - genre):

The Golden Filter - "Voluspa" - Electropop (My favorite album of 2010 so far)
Phantogram - "Eyelid Movies" - Big Beat
The Young Veins - "Take A Vacation" - Retro/Rock
The Vaselines - "Sex With An X" - Alternative
The Hundred In the Hands - "This Desert" - Electronic
Devo - "Something For Everybody" - New Wave
Edward Sharpe & The Magnetic Zeros - "Up From Below" - Indie Folk
Atmosphere - "When Life Gives You Lemons, You Paint That Shit Gold" - Rap/Hip-Hop
Megafaun - "Gather, Form & Fly" - Folk
She & Him - "Volume Two" - Indie

I saw Crystal Castles mentioned, they're awesome. Also another Indie/Alternative radio station stream to check out is 89.3 The Current out of Minneapolis.

And I agree with the Pandora/Last.fm suggestions, although I haven't used either for quite a while to find stuff, they do work well.