SkyWeb Express Personal Rapid Transit - http://www.skywebexpress.com/ Transit system of small, computer controlled vehicles traveling on-demand nonstop between stations on a network of slim guideways. Part of Taxi 2000 Corp.
The Advanced Transport Group (ATG) - http://www.aer.bris.ac.uk/atg/ Researching and designing ULTra, a small vehicle, top mount monorail guideway, urban transport system for the future. University of Bristol, UK.
SkyTran - http://www.skytran.net/ Personal rapid transit that may go 100 mph and should cost less than roads or traditional fixed guideway rail systems.
Taxi 2000 Corp. - http://www.taxi2000.com/ Proposed, prototyped system. Personal Rapid Transit article by Dr. J. Edward Anderson states design philosophy, economics, operation, optimization, potential. Descriptions, diagrams, photographs, videos, news, FAQs, links.