Seldo.Com
This discussion of Tumblr's architecture and scaling problems is dense but extremely interesting
It's really interesting to see how much they are built on work at other industry leaders like LinkedIn and Twitter.
Recent posts
On Internet surveillance and the role of the state
A very brief history of US government Internet surveillance programs
The origins of life
Tumblr will kill RSS
Why all Americans should be in favor of immigration reform
Blue-collar knowledge workers will save the economy
HTML5 vs. Obj-C is not the same as PHP vs. C
Others
2012 Presidential Election: the polls to watch
A conversation with Rick Santorum