1) I discovered my entertainment center devices (DVR, Wii, audio receiver, DVD player, etc.) draw 89 watts when not in use. 24 hours a day, 365 days a year. Not to mention the heat that they throw off, which fights my air conditioner in the summertime for even greater total cost. They're now shut off at the power strip except when I'm using them. This saves me around $150 per year in energy costs.
2) Heating. My apartment uses two high efficiency electric heat pumps. There is a silent mode that I used for the entire heating season last year and an eco mode that makes more noise but uses the heat pump instead of an electric heating element. The difference in energy consumption between the two settings is massive. The heat pump draws about 800 watts per unit. The electric element draws 3,000 watts per unit. My energy savings will be about $30 per month by using the slightly noisier heat pump setting. Total cost savings are approximately $130.
3) Washing. The economy settings on the dishwasher and clothes washer produce an indistinguishable result compared with the hot water setting and use 1/3 the energy. This is something I knew before, but seeing the cost numbers is remarkable. My energy savings will be about $9 per month with no downside.
For additional reading on Vampire Power or the products discussed in this post, visit:
Laurence Berkeley Laboratory info on Standby Power: http://standby.lbl.gov/faq.html
CurrentCost Energy Monitors (shown above) http://www.currentcost.com/
The Energy Detective (TED) brand power monitors http://www.theenergydetective.com/