I recently had the misfortune of spending a few days with my son at the Children's Hospital in Milwaukee, Wisconsin.  My one month old son contracted a virus and had a temperature of 101.  It was very scary and I don't recommend it to anyone.  However once his temperature went down and we all breathed a sigh of relief, I saw something pretty cool at the Children's Hospital.  They have a robot named Tug that drives autonomously around the hospital delivering and picking up medical supplies.

He's a five foot tall robot and is made up to look like a train.  He toots and whistles as he's coming down the hall.  He has a large storage compartment that can be accessed from the back.  He comes with several sensors to detect obstacles.  Of course he has wireless networking capabiiltes which he can use to call the elevator to pick him up and take him to a different floor.  He's very courteous and moves over to the right so he doesn't take up the whole hallway.  He tells people around him what he's doing like turning around or waiting for the elevator so that they can move over.  I thought that was excellent.  I didn't really want to be at the Children's Hospital but it was neat seeing the robot.