This post was published more than a few years ago (on 2004-03-17) and may contain inaccurate technical information, outmoded thoughts, or cringe takes. Proceed at your own risk.
Better said than I ever could, a fine description of life with the Littermaid robotic cat box.
http://www.penny-arcade.com/news.php3?date=2004-03-15
(It's in the entry called Torun Jax, Blind Jedi. I suppose you could skip the first sentence about the blind Jedi if that sort of thing bothers you.)