Rich Karlgaard wrote an interesting editorial in the June 19th, 2006 issue of Forbes. In the article, Karlgaard discusses two books which outline the core characteristics of the entrepreneur. One of the books, "The Hypomaniac Edge: The Link Between (A Little) Craziness and (A Lot of) Success In America" is by John D. Gartner and essentially states that American entrepreneurs have a condition of "hypomania" which causes them to to be "brimming with infectious energy, irrational confidence and really big ideas".
Read Karlgaard's article, Blessed Are the Hypomanic.
While we haven't tagged any of the entrepreneurs featured in eClips as being "hypomanic", we have noticed that these folks do continually mention specific traits such as being "risk-takers", "passionate", "decision-makers" and "visionary" that are core to the success of an entrepreneur.
Look at the list for yourself in the eClips theme section, Life As An Entrepreneur.