The venture capital fundraising climate is downright Darwinian these days, says National Venture Capital Association president Mark Heessen in this episode of The Deal's Behind the Money online video show. While marquee firms -- such as the new Andreessen Horowitz and the venerable August Capital, Khosla Ventures and Matrix Partners, all of which have raised large funds this year -- are thriving in the current climate, lesser-known ones may find the cupboards bare.