The Y Combinator Database - The definitive database of YC companies with all the metrics
CS183B - Startup Class - Stanford class taught by Sam Altman & guest speakers
Y Combinator Companies - Interactive list of all 1000+ YC companies
Classroomies - Watch Stanford CS & Startup lectures together
Startup School - How to start a startup, by Y Combinator
Woz U - Steve Wozniak's new tech education platform