Lee Holmes posted this automatic Cat feeder he built. Uses a CD ROM. Here's the quote: I have two wonderful cats, and many wonderful neighbours. Naturally, for my vacation, I combined the best of both worlds and had one of the neighbours watching my cats. Despite this, I didn't want to force my neighbours to come over twice a day to feed the cats. So I sought out to make an automated cat feeder and water dispenser out of parts lying around the house. As for the cat litter? That's fine -- that can be left to stupid humans :) Description here: www.leeholmes.com