Using the USB port as an output for a projector

[smirky]

Suppose I had one of these:

or a DVI, or an HDMI port, doesn't matter... What software should I use to make the whole thing work? An app, drivers or there's a way using the normal settings?

Here's what I'm talking about:

http://www.youtube.com/watch?v=2SU4Czu3LpU (not using the usb port, but still cool)
http://www.youtube.com/watch?v=VKk81PKr98A (using the usb port)
http://www.youtube.com/watch?v=YXveu7ZHAcY (using the usb port)