The Google Cemetery - A list of dead Google products and why they died
The Y Combinator Database - The definitive database of YC companies with all the metrics
Startup Graveyard - History shouldn't have to repeat itself
Y Combinator Companies - Interactive list of all 1000+ YC companies
Failory - Failory is a community visited by startup founders every day to read articles about entrepreneurship, interviews with failed and successful founders, insightful postmortems and our monthly reports.
Startup School - How to start a startup, by Y Combinator