Now I'm starting to switch to energy saving light bulbs, which, I read, should be left burning at least for 15 minutes. So the lights in the kitchen are now on more-or-less permanently when I'm at home. That means, on a normal workday evening, 1*5 hours instead of 10*1 minute plus 30 minutes for cooking dinner.
I'm not sure if this would actually be saving energy if all five bulbs were energy savers. With only one of them, so far (the others refuse to break down), I'm sure it doesn't.
ETA: Vaguely on-topic (re: saving energy) -- a little alternate history from the Guardian: "No one thought Al Gore would be a loveable president, but, after eight years in the White House, he has gotten truly tiresome". (via MakingLight).