This command line utility can change speaker mode (5.1 surround, headphones, stereo speakers, 7.1, 4.5..) without going to control panel all the time. Ideal for gamers and htpc addicts for changing speaker mode with a shortcut/hotkey or from a remote control button.
Examples:
"speakersetup 5.1" will change to 5.1 surround sound speakers.
"speakersetup hp" will change to headphones.
More speaker modes can be found in readme.txt.
Download it here: speakersetup