a LitterMaid robo-catbox!
OMG do I love this thing! apparently, so do the cats - I'm pretty sure all 4 of them are using it on a regular basis. (kinda like the *clean* poo huts out on the playa - once you know it's there, you want to go there all the time.)
it senses when a cat is in the box, then waits 10 minutes and runs its rake. every day I empty the container and scoop the box to get the bits the rake misses. so easy to do, and the kittehs always have a clean box! even Princess Bruce loves it.