On my music player, I have 614 artists. Some of these are single songs from samplers/soundtracks, but I'd say I have about 400 artists on my Zune with at least a full album from them.
01/12 - Zero Boys?
01/16 - Origin w/ Trog
01/24 - Into It. Over It.
02/09 - Amon Amarth w/ Enslaved, Skeletonwitch