The best way to get through a big chunk of work while staying focused is to list your priorities on paper before you start. Trying to keep a big list in your head is a sure path to procrastination. Plus, it's a great feeling to tick off items as you finish them. Put on some music, close down your email, and get busy.
But then you have people trying to get your attention. Make sure your colleagues and clients know that you prefer to receive their queries in email rather than in person or by phone. Bugs go directly into the tracking system, without anyone having to tap you on the shoulder for each one. Sounds obvious, but stopping your work to discuss something for 5 minutes can sometimes cost you 30 minutes productivity by the time you are focused again.
