Mixergy - The YC Stories - How YC companies - Airbnb, Dropbox and more - Got Started
Y Combinator Companies - Interactive list of all 1000+ YC companies
Vibe Boost - An interactive digital museum of video-based art.
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
Endangered Sounds Museum - Nostalgic sounds from the past
Startup School - How to start a startup, by Y Combinator