I work on a game, like it's good to have little projects, basic games, Game Maker or whatever my brain can muster. I tend not to get bored very often, more likely to be insomniac than bored, but it's the same thing - give the brain a little treat, remind it that you still care, and it tends to let me sleep, or at least shut up.
iPhone/iPod/iPad games are pretty handy as well - especially Monopoly. I mean, playing against 3 AI players, I can get through a game in 30 minutes, good old Monopoly needn't take 7 hours, cause divorce, bloodshed etc - just eliminate the human element and your set.