Every little bit helps! These fifteen steps from Katie Singer are also good initiatives towards reducing energy usage, reconnecting with the physical world, and saving your sanity.
I like number 5 the best:
5. Think of your mobile phone as a message-taker. Program it to let you know every two hours whether or not you’ve got a message. (This way, you won’t get zapped 24/7; and you’ll get more work done, since you won’t have to respond to constant messages.) Turn off the bluetooth and Wi-Fi antennas. Keep them off. If you must make a call, keep the phone in speakerphone mode. Do not keep the phone near your head, in your bra or pants pocket.