What do you do to boost your creativity and/or productivity?
vital101: I agree with the comment about going for a long run.  I always seem to be in a better state of mind after a few miles.  If I'm still having issues maintaining focus, then I try to make a list of everything I'd like to accomplish today.  By setting smaller goals I get a deeper sense of satisfaction with my work.  On a historical note, this is the same notion that is applied in war.  Instead of setting your object as "winning a war", the object becomes "take the next hill" or "win the next street".