These are the artists I primarily trade but I am always open to something new:

Animal Collective
Autolux
Beastie Boys
Beck
Bjork
Boards Of Canada
Chemical Brothers
Crystal Method
Deadweight
Death in Vegas
dredg
Faith No More
Fantomas
Gorillaz
GWAR
King Crimson
Laundry
Les Claypool
The Mars Volta
Massive Attack
Meat Beat Manifesto
Melt Banana
M.I.R.V.
Morcheeba
Mouse On Mars
Nine Inch Nails
Nirvana
Opeth
Orbital
Oysterhead
Parliament/Funkadelic
A Perfect Circle
Pink Floyd
Portishead
Primus
Prodigy
Radiohead
Rammstein
Red Hot Chili Peppers
Sausage
Sigur Ros
Smashing Pumpkins
Soundgarden
Spoon
Squarepusher
Tomahawk
Tool
Tricky
Zwan

I will gladly trade you many things if you have any of the following bands:

13 & gOD
Animal Collective
Boards of Canada
Born Naked
Laundry
M.I.R.V.
Mouse on Mars
Meat Beat Manifesto
The Nationale Blue
The Notwist