Ribbon Farm — experiments in refactored perception says it all.
Dave Chapman's very interesting take on meaning.
LessWrong — rationality for the XXI century. I feel that the guy who started this site could be the smartest bloke on the planet.
Cal Newport will tell you how to manage your time efficiently & wisely.
Here you can check if your e-mail has been compromised.
Encrypted Dropbox (& more)? There you go.
Nice visualisation of tree search algorithms.
40 Key Computer Science Concepts Explained In Layman’s Terms.
ADUni — this undertaking was exceptional and Shai Simonson explains things as good as Herbert Gross does.