Good magazine has an interesting chart in their latest issue that details how much energy your vampire devices use, and how much it costs you to keep them plugged in. The guide differentiates between devices that are in “active” (ready to leap to life) and “passive” (just plugged in) standby modes, and some items are real shockers. A plasma TV, for instance, can cost about $160 per year just to keep plugged in. That Wii you got your hands on? $25 before you even hit one virtual tennis ball. The takeaway for me, at least, is thinking about putting some devices on power strips and turning them off if I know I won’t be using them for a day or more.