Instructables user labelreader made this clever kitty-powered feeder. This

automatic feeder that takes 5 minutes to make, and requires no soldering, no motors, and no batteries. Your cat’s own clever paws knock just a few pellets out at a time, so this dispenser is self-regulating according to a simple algorithm: while your cat’s hunger exceeds his laziness, he shakes the feeder, eats the pellets, repeats.

I’m going to try to make one of these for my little furry tubster. Via the Instructables Weekend Builder.

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VCR Cat Feeder on Make: Projects