I have similar problems getting my mind on focus. Either the office is too noisy, or to hot (we have bad ventilation and too many computers), or someone is making unreasonable requests, and I get off track, and unfortunetly it may be a week or more before I can truely get back on track again. But then something else comes and de-rails me. I found that I work best when I have the office to myself, or listening to loud music (Jpop usually). Games also help, taking a 15 minute break to play a quick game helps a lot, unfortunetly some games are more addictive than others, and lead to longer breaks ;)

Arashi