PocketCam
PocketCam lets you use your Android device as a wireless webcam for your Windows-based computer or Mac (OS X 10.5 or above). PocketCam automatically forwards video captured by your Android device's built-in camera, which can then be used as if they come from a virtual webcam. PocketCam works with any Windows-based webcam applications, including instant message applications such as MSN LIve Messenger, Skype, AIM, etc. For Mac users, PocketCam works with any Mac applications that use QuickTime for video capturing, including GTalk, Skype, and aMSN.