Ask HN: What development blogs do you recommend?

I've been dying to get more development feeds into my reader. While I've been known to comment on information overload a bunch of times, the fact is that development feeds are like a pulse into the world of new technologies, something I care deeply about. So who and what should I be subscribed to? I personally care about ruby, objectivec and nosql, but to keep things interesting for the Hacker News as a whole, feel free to send in recommendations for anything development-related. OPML files would mean extra points. Thanks everyone!