[adam0101]

Rock, some elctronica, and hip hop would be ideal. I'm more into indie rock, stuff like company of thieves, band of skulls, the hush sound, jack's mannequin, etc. Although I can listen to some electronica like mgmt and can also listen to some hip hop.

[insipid]

Can't help with the rock/hip hop, but for electronica (and its ilk) I would recommend: soma.fm (or, apparently, somafm.com, now.)

(For example, the "cliqhop/idm" shoutcast stream is what I use when I need non-distracting music in the background, for working.)