This is why I sit at the desk with a pen and paper and my computer. When I'm trying to work something out, I write stuff out and make sure that my plans (and the stuff I have to keep track of) gets down onto paper. Sometimes I even draw a picture. Makes it much easier to refocus after being distracted (I just read my freaking notes). I'm interruptible, very productive, and I can refocus pretty much instantly.

//file this under benefits of a liberal arts education...