RPG Blog [1], run by Zachary Houghton, is a great place to find thorough RPG reviews [2], interviews [3], gaming news and links to free products (among other things).
Zachary (who is also a moderator on TT’s GMing Q&A Forum [4]) is tireless, upbeat and friendly, and his enthusiasm is infectuous. RPG Blog is a pleasure to read, and there’s plenty of good stuff there for GMs — I highly recommend it.