Amazing Facts: A collection of mind-blowing facts and information via Quora.
Cassandra: The Apache Foundation's highly scalable, distributed, structured key-value store database.
CSS: InstaCSS is terrific online resource for CSS-related documentation.
LOLShirts: An online store featuring a bunch of hilarious graphic tees.
Mon.itor.us: A free website/server monitoring tool.
Node.js: A beginners guide to learning Node.
Optimization: 20 online tools for measuring website performance.
Photography: A brilliant showcase of industrial photography including factories, railroads, etc.
Python: A from-scratch tutorial for creating dynamic websites.