I find these sorts of posts more useful than blog posts about web scale technology. They're more relevant to a much wider group of people. For example, while it's interesting that Netflix are migrating their billing system to AWS, and the way they solve their problems is fascinating, the actual technology stuff is only useful if you're likely to face a similar problem, and the chances are you aren't. In fact, if you're reading their blog posts to learn things, you're probably going to massively over-engineer your next web app.
That said, Khan Academy has some interesting tech:
http://engineering.khanacademy.org/posts/aphrodite-inline-cs...