Phillip,

The Chip is the Mitsubishi M64282FP - more info here :-

http://homepages.paradise.net.nz/~vkemp/gbcam.htm

You set the exposure time on the chip for acertain number of clock sysles, then it stores the frame on on-chip RAM, you can then clock the data out at your leisure.

As for Optic flow, there was a New Scientist Article on it a while back, if you subscribe you can search their article database for it, it was fasinating.

Chris.