Where to start?
Replacing one 75 watt light bulb with an ENERGY STAR certified Philips 14 watt LED light bulb will save 65 kWh of electricity annually, and can reduce associated carbon dioxide emission by 92 pounds (based on 3 hours per day use and 1.43 lbs CO2/kWh).
Putting in a WaterSense labeled Evolve 1.5 gpm showerhead can reduce your water use by 3,650 gallons a year (assuming a 10 minute daily shower).
When you turn off electronics, really turn them off. A TrickleStar advanced power strip will insure that plug-in devices are not only protected against surges and cut power to those same devices when the main item is turned off.