The BeetleCam Project
digital-photography-school.com
digital-photography-school.com
That camera was a birthday present, but it led me to finding Mr. Lee's cat cam site, with a lot more hacker-friendly cat devices: http://www.mr-lee-catcam.de/
Or maybe it's just the "I could have thought of that!" feeling.
with this setup you need a really wide lens or a fish-eye to make a good composition. cool up-close photos but you give up control over the mechanics of the camera.