After I get going in the morning, I just fire up Songbird and blast the heaviest metal I have. Metallica, Six Feet Under, Slayer, Cannibal Corpse, Deicide, whatever. For some reason, and it probably has to do with the ADHD, it just puts me in that perfect groove for slamming out my best code. That stuff for a time and then it's on to some John Coltrane or Johnny Winter for a while. Back and forth once or twice a day.
I don't know, but heavy, fast paced thrash metal just puts me in that perfect mindset... Just had to make sure I got good earphones so I didn't annoy the hell out the people in the adjacent cubicles!