A search on the ‘Net found what I was looking for: the 4-wheeled Segway, the Centaur in the November 7, 2004 issue of Popular Science.
Nice, Nice. Of course there isn’t any new info about it since the November 7, 2004 article. It is now called the Concept Centaur on the Segway website at Segway.com. Here is a link to a video on it; Windows Media format, of course! And a slideshow . I’ll probably have to convince Wifey of my (immediate) need for the Segway