I had some work to do with webcams and video streaming in the weekend. Browsing through forums and web sites I discovered two nice programs and I had some fun playing with them: they are ManyCam and VHScrCap.
ManyCam lets you control multiple webcams and add effects to the video stream.
VhScrCap installs a virtual video driver that adds a video source attached to a region of your screen.
You can use them to create a video stream that mixes your screen with your face. Ever wanted to show your screen to your friends over Skype, or see their screen when they ask your help to fix their computer? Bingo!
This is a little demo that just scratches the surface of what can be done.