"Sam Altman is the current president of Y-Combinator and was previously a founder at Loopt, which sold to Green Dot Corporation for $ 43M. As head of YC, Sam often dispenses an entire guide's worth of information through his blog. Sam's "Startup Playbook" will walk you through everything a great startup should have from ideation to product instantiation, and is an invaluable tool for aspiring venture investors. Additionally, Sam's been kind enough to host the 20-episode video series, How to Start a Startup--originally a lecture at Stanford--on his blog. The series includes talks from luminaries like Paul Graham, Marc Andreessen of Andreessen Horowitz and Reid Hoffman, founder of LinkedIn."