I know I'm way-behind on this,My wife splurged post-Christmas and bought a vacuum cleaner robot. I think this is it:
http://store.irobot.com/product/index.jsp?productId=11305110
You can schedule it when to clean and I have to say, it is a very good cleaner. If anyone remembers the Jetsons, she calls it "Rosie". With 2 cats, 2 dogs, 2 kids and a chinchilla and a pretty big house, vacuuming is a pretty big chore. It does 1-2 rooms per day on its own schedule. Works great on hardwood and carpet, and rooms with both like an oriental rug.

