Watch tv or anime (Hellsing rocks!), or listen to music. If I'm writing, then I play soft, Celtic music or environmental CDs like beach waves hitting the surf or rain in the forest. If I'm rendering, then it's fun stuff to sing to: Tom Lehrer, Weird Al, the Muppets, etc. And occassionally skritch the cats, especially the one who tries to edge me out of my chair. (Like right now, in fact.)