I usually keep separate Firefox windows open: one for distractions (with the basic four tabs: google RSS reader, gmail, facebook, and news.yc), and 'n' other wi

I usually keep separate Firefox windows open: one for distractions (with the basic four tabs: google RSS reader, gmail, facebook, and news.yc), and 'n' other windows for work. You may not need to be as explicit as a different computer on the other side of the room. I wonder if it would be enough just to theme your firefox windows. You could have the circuitboard theme for work firefox windows, and the carebears theme for play windows. The theme could change depending on what tabs are open in the window.