Here's what's on my list:
Do: take a cold shower; meditate; throw yourself in; work on hard problems. Don't: be annoyed or upset; lie down unless to rest without computer.
It's working for me pretty well so far. For me the list's main value seems to be in those small, split-second decisions: if I'm choosing between two things to work on, my mind will suddenly remember "work on hard problems," and I'll choose the harder one.