http://www.custdev.com/ - Learn how to do Customer Development, an essential component of the Lean Startup philosophy. Learn how to: Find prospects and how to approach them, Develop and iterate your "Minimal Viable Products" (MVPs), Segment markets, position products and when to pivot, Validate before scaling"

http://www.lulu.com/product/paperback/startup-lessons-learne... - "Written by Eric Ries, one of BusinessWeek's Best Young Entrepreneurs of 2007, Startup Lessons Learned is a collection of 128 essays originally published at StartupLessonsLearned.com from 2008-2009. Each essay, or blog post, is unmodified and presented chronologically, rather then thematically, so that the reader can see ideas develop over time. Eric Ries provides actionable insight and advice on how to build successful products by listening to and learning from your customers. Startup Lessons Learned is a must-read for anyone trying to build a company in this new economy."

http://www.startupbook.net/ - "Start Small, Stay Small: A Developer's Guide to Launching a Startup"