I bought...
...a Roomba! It's one of the entry level models, figured I'd try it out before spending the money on a high-end one. As a recent adopter of a dog and a cat, I'm finding the pet hair situation just gets out of control, and I'm sick of vacuuming 3 or 4 times a week.
Anyway, I've had it for a couple of days and so far I'm really impressed. It's one of those pieces of equipment that when you first get it you, you kind of marvel at how well thought out the design is. It picks up a LOT. Next purchase is going to be the rapid charger/base station/remote package they offer, so I can automate when this thing runs!