I have really enjoyed reading through Initiative One recently. It’s a great little blog that unfortunately seems to have been inactive since September of 2010. Even when it was active, it was not very high volume (38 posts 2008 – 2010), but just about everything is worth reading. It has a wonderful historical perspective on OD&D; I read it from cover to cover.
(Aside: I’ve been pondering writing a scraper script that would transform Blogger blogs into epub format documents to make it easier to read them chronologically and offline. There are so many high-quality OSR blogs to catch up on, but Blogger does not make it very convenient to read blogs in that way.)