I got robots! This may not qualify as home improvement exactly but it has improved my home.
I got a pair of bots from irobot, one that vacuums and one that mops. These things really work. I think they may do a better job than I do just because they go over the floor many more times than I do. I had just vacuumed and was amazed at how much it picked up.
The vacuuming robot will do three average rooms,(850 sq ft), before it gets "tired" at which point it finds it's base and goes to sleep,(rechages). You can even program some models to do your house very day while you are at work. It does carpet and hard floors both and it tells you when it's full too. Other than emptying the dirt bin you may never have to lift a finger to have clean floors again.
I have only used the mopping bot once so far but it did a great job and leaves the floor nearly dry.
I got the pair on a one day special for about $400.00 and I had to share how happy I am so far. If you need a vacuum you should check these out.
The ones I got were the irobot "roomba 535" and "scuba". Now if there were just a real good lawn mowing bot I could almost forget house work entirely! Here's a link
http://irobot.com/ where you can watch a video.