If you like old school D&D, or just well written blogs you need to check out The Tao of D&D. The first thing I do when I fire up Reader every day is rush to read Grognardia, Torch, Pole, and Rope, LotFP, Greyhawk Grognard, and flip through the various video game blogs to which I subscribe. Tao of D&D is different, I save it. It isn't something I can read while I am in class, it is something I like to take my time and think about while I read. I do not always agree with Alexis, but he has one of the most thought provoking blogs in RPGs. He also goes into insane (the good kind) detail. You will walk away from his blog with good ideas for your game, and probably having learned something new about history, or geography.