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Save the planet big excerpt from http://www.climatesaverscomputing.org/pwr_mgmt.html :

• Limit screen-saver use. A screen saver does not save energy. In fact, more often than not, a screen saver not only will draw power for the monitor, but also will keep the CPU from shutting down. Instead, set your computer to turn off the monitor first, then go into standby mode after a longer period of inactivity.
• Keeping your Virtual Private Network (VPN) connected may limit your system’s ability to enter standby mode. We recommend you disconnect your VPN when not actively using your corporate network.
• Many popular computer games and other third party software packages that run in the background will not allow the computer to go to sleep – even if they are paused or the active window is minimized.
• Some web sites or pages that have active banners and or animated advertisements will not allow the computer to sleep on its own and must be closed, or the computer put manually into a sleep state.
• Advanced users may wish to establish multiple power schemes to address different usage models. For example, you can create a power scheme for playing music CDs that shuts off your hard drive and monitor immediately, but never puts your system into standby mode.
• To maximize the battery life of your laptop computer, consider setting even more aggressive monitor, hard drive and standby/sleep settings for battery mode.
• To further reduce power consumption, turn off computing and peripheral devices that are not being used or being used for an extended period of time such as overnight.
• Plug all your electronics into one surge protector, so you can easily switch them all off when you leave the room or go to sleep. Most power supplies (such as your cell phone charger) continue to draw power and generate heat even when not attached to a device.