PocketCam (iOS, Android, Windows Phone)

PocketCam lets you use your iPhone as a wireless webcam (and microphone!) for your Windows-based computer or Mac (OS X 10.4 or above). PocketCam automatically forwards video captured by your iPhone camera, which can then be used as if they come from a virtual webcam. PocketCam works with any Windows-based webcam or video conferencing applications, including instant message applications such as MSN LIve Messenger, Skype, AIM, etc.