I've seen Segways in use here and here over the past couple years, but they certainly haven't taken off as promised. As a matter of fact, for all my faith in the future the Jetson's promised me, the only major robotic-type advance I've seen that really panned out is the Rhoomba - www.irobot.com
When we moved into our new house we decided to keep the dogs in just one section, on tile floors and away from the hardwoods and the sleeping areas. We were cleaning that section every day, then I bought a Rhoomba at Costco, just to try it out. We now have two, and they are a perfect addition to the ER lifestyle. They do a great job in our situation, and I can sit on the sofa and read a book while I'm vacuuming 2 rooms simultaneously!
My DW loves them, calls them the Goombas. The dogs ignore them completely. And evey day they suck up a tremendous amount of dog fur and other material. Even my daughter, who is fairly allergic to the pugs, says she breathes much easier now when she visits. I'm a fan.
But I'm still waiting for a functional Jetpack.