I know threads have blazed, with great fury for many, many pages of heated debate over this... but noticed an interesting bit of research that sheds some light on the debate and also adds some never before considers factors that might find themselves being incorporated in new bike designs.. or not.. good read.
http://www.scientificamerican.com/article.cfm?id=self-stable-bike
http://www.scientificamerican.com/article.cfm?id=self-stable-bike
