On a couple of recent business trips I saw several groups of Segways, leading me to rethink my notion that this device was something of a flop (and thus not a good omen for other gyroscopically stabilized forms of transportation).
First LA, where the Segway is used on the Universal Studios complex. I stayed a few nights at the large Hilton there and saw staff using the Segway to speed up trips between different parts of the very large property. I also noted that you can rent Segways in Santa Monica.
Then I was in Chicago, again staying at a Hilton, from where I spotted what appeared to be a US Postal Service Segway training class headed down Michigan Avenue. Looked a bit like robotic ducklings following their mother. I tried to capture the scene on my Treo's camera but no luck.