Y Combinator Companies - Interactive list of all 1000+ YC companies
Louvre Museum Online - Explore the entirety of the Louvre's collection for free
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
Sounds of Maine - Interactive tours of Maine sights and sounds
Startup School - How to start a startup, by Y Combinator
Mixergy - The YC Stories - How YC companies - Airbnb, Dropbox and more - Got Started