I bought a Kill-A-Watt power meter a couple of years ago to figure out how much power various computers, peripherals and gadgets I have use. Now, adafruit industries announced…
Tweet-a-Watt kits now available…
This Open Source hardware project tells you how to modify your own Kill-A-Watt to tweet power usage data. You can also buy prebuilt kits [...]

From USA Today…
Leaving PCs on overnight costs companies $2.8B a year
We’ve always known this wasteful behavior has a cost associated with it. Now, it has a number assigned to it and it is a big one. Windows users can Hibernate their PC. It works reasonably well on XP and Vista though it is not 100% [...]