My tastes are far too varied to go into much detail here*
Tool
Tricky
Masive Attack
Kosheen
Pink Floyd
Velvet Underground
Lamb
Radiohead (nmot as much these days, though)
Björk
Cog I have to plug these guys every chance I get - they're that good...
DJ Shadow
Jeff Buckley
Elliott Smith
P J Harvey
I could go on like this...I mainly listen to electronic stuff these days, however
Oh and I actually don't mind some country, either. More of the 'classics' though most recent country is absolute rubbish.
*I was going to say ecelctic, but I forgot the word, because it was too pretensious.