I do the same as most of you:

-shop only sales and stock up on good sales
-big couponer
-turn of lights when not in the room
-turn down the heat when we leave the house for more then an hour
-HUGE fan of the library
-buy craft supplies when discounted/on sale when I can
-only run dishwasher and washer/dryer on off peak hours
-buy daycare equipment second hand when I can
-lots of homecooked meals in large portions for leftovers (used for daycare or hubbys lunches)
-get cash back when shopping through CO51

I am sure that there is more, but my brain is on Friday mode.