Lean Startup Conference 2012. Sixteen mixed-length videos (~5 to ~30min) on lean startup process and experiences from practitioners including: Marc Andreessen (Netscape, Andreessen Horowitz), Scott Cook (Intuit), etc.
Stanford Entrepreneurship Corner. A big collection of video-recorded talks at Stanford on a variety of topics, including: Creativity & Innovation, Opportunity Recognition, Team & Culture, etc.
Kauffman Founders School. A series of short videos (~5-10mins) on entrepreneurship (lean methodology, intellectual property, equity, etc).