Todd Hoff's High Scalability [1] is a very nice blog to follow if you like this kind of information about real-world stacks. He's been writing it for years. (Caveat: It's a while since I followed it closely.)
Stuff the Internet Says on Scalability is an excellent weekly article he does with plenty of great resources. Lots of stuff that's just reposted from HN, but also many pieces on real-world architectures that I never see on HN or /r/programming.
[1] http://highscalability.com/