When at work with my colleagues, pretty much anything on the radio or anything not too intrusive.
When at home doing stuff or alone at work:
Teebee, Amon Tobin, Carcass, Nasum, Boxcutter, Luke Slater, Slayer, Freq Nasty, Si Begg, Tipper, Burial, Kilowatts, JNR Hacksaw, Beastie Boys, Aquasky, Gorillaz, Aphex Twin, Dizzee Rascal, In Flames, Ladytron, Funkstörung, Audio Bullys, Fear Factory, Vex'd, Kraddy, Orbital, Monkey Mafia, Pendulum, Rob Zombie, Bassnectar, Black Rebel Motorcycle Club, Autobots, Skitsystem, Noisia, Ministry, Chemical Brothers, Evil Nine, Death In Vegas, ILS, Crunch, The Streets, Stanton Warriors, Leftfield, Foo Fighters, Beck, Röyksopp, Faith No More, M.I.A., Entombed, Technical Itch, The Dead Guys, Primal Scream, Teddybears STHLM, Massive Attack, Roots Manuva, Cypress Hill, Herbalizer, Evol Intent, E.V.A.C., Son Of The Electric Ghost, Boards Of Canada... etc etc etc... simply too damn much to list.

Music fuels me.