I use to have my own office and pretty much just worked alone. While it's hard to slip into the zone, it's great when it happens for those magical 2 or 3 hours, and you do lots of work.
Now, I'm in a room with other people, and having to pay attention to everything else makes the zone slipping hard to do. Anyone know if self-hypnosis works here?
And practicing meditation can't hurt, it'll help with focusing.
Stuff with a white-noisy background and a steady, brisk rhythm tends to block out the din of the workplace and helps me stay focused for longer periods of time. Was the only way I could cope with the loud, obnoxious sales staff sitting nearby. Oh, and avoid music with lyrics.
ftp://ftp.scene.org/pub/parties/2007/assembly07/music/instrumental