Tweet a Watt now works with Google Powermeter
The Tweet-a-Watt is a cool hack that was made by Adafruit (Limor Fried and Phillip Torrone). It would tweet your energy usage from one outlet so you could be more aware of how much juice you're pulling through the lines. Now you can connect it with Google's Powermeter and get some nice graphs of your energy usage. Hit the link for more info and get the code to do it yourself.