I've done various things... I'm a bit of a budget and savings nut! Some of this won't apply to you, but might help others.
-New HVAC unit. If your A/C and heating system is more than 15 years old, replacing them will likely save you money. ESPECIALLY the A/C unit. They are much more efficient now and work just as good or better than your old one. My summertime electricity bill has nearly been cut in half by replacing a 30 year old unit.
-Replace the fridge/freezer. Once again, old appliances use more electricity. I read somewhere that a fridge that's 30 years old could be using as much as $10-20 monthly all by itself.
-CFL bulbs. Changing one might not change a lot, but if you change them throughout your house, you're going to notice a little bit of savings when you get your bill.
- Heated mattress pads. Get one, and then you can bump down the heat a few degrees at night time. You'd be surprised how much difference this makes. I was keeping my heat at 65 degrees at night this past winter while i was toasty warm under the covers!
- Turn off all appliances when not in use, especially computers. They don't use a ton of electricity, but you can save yourself a buck or two every month if you keep those computeres turned off when you're not using them.
- Open windows when you can. Make good use of fans. If you're going to be sitting in one spot for a while, point a fan at you. You'll feel like it's about 10 degrees colder than it actually is.
That's just a few ways that you can save on that electricity bill. If you don't have A/C or heating, then you're already far ahead of the curve!