Magic Camera
"# Dual Mode Virtual Webcam that can do simulation under either kernel mode or user mode to trade off compatibility and performance for different webcam software. Unique!
# Multiple virtual webcam. You can add unlimited virtual webcam on one PC and use them independently. Very useful if you have multiple real webcams or want to open several broadcast channels/webcam chats at the same time.Unique!
# Large output resolutions supported, up to 1680*1050.
# Fully support Adobe Flash Media Encoder."
Source: http://www.shiningmorning.com/