Do epic shit
matthew-sinclair.tumblr.com
matthew-sinclair.tumblr.com
For me, Khan Academy (http://www.khanacademy.org/) was one of the most amazing, world-changing things that I saw across the entire technology industry in 2011. In particular, the stuff on Cosmology and Astronomy (http://www.khanacademy.org/#cosmology-and-astronomy) is just fantastic.
What blew you away in 2011?