Windows only: Open-source system tray utility Aerofoil helps keep your Windows notebook running longer by automatically turning off Aero Glass and other battery-sucking preferences when you disconnect from a wall outlet.
In addition to disabling Aero Glass, Aerofoil can also switch between your custom Windows power plans, mute sound and manage the Windows sidebar. You can also manually disable or manage Aero Glass from the tray icon, as well as go into quick hibernation. Once you plug your system back in, the tray icon turns from red to green and will automatically switch back to all your normal preferences.
Your configuration is controlled through the installer itself, so you set it up once and forget it. If you ever need to change your preferences again, just run the installer and reconfigure your preferences.
Aerofoil is a free download, open source, and works with Windows 7 and Vista only.