Tips for Game Masters, by Alan De Smet, is an extensive collection of tips that can be applied to most games.

This is some of the best, most thoughtful and most thorough GMing advice I’ve ever read.

If you’ve run into a new GMing situation, see if Alan has covered it here. And if you’re looking for an overview of GMing techniques — or a refresher — it’s a great place to start. (Via DM Haven.)