What cameras are available

I'm really looking to the future at a project I'm planning, but wondered what camera setups are available.

It seems that a lot of people use the Blackfin(?), but I wondered what alternatives there are. Lots of mentions about the AVRCam, but that now seems unavailable.

Alternatively, a couple of years ago, I upgraded my security cameras, and have a couple of wireless cameras that I can "hack". Is that feasible?

CtC just bought a cheap eBay

CtC just bought a cheap eBay wireless camera. He is processing the output of the receiver on a PC using the “Processing” software.