These introduce the basic concepts and the lingo. They're all self-contained pieces, rather than sprawling sites or continuing blogs. No prerequisite knowledge required.
Want to keep learning? Now that you know what the basic concepts and major players are, wade in a little deeper. Includes older pieces on Scientology.
These items are for devotees. They're either blogs that continually update, highly focused sites or pieces, tangential, or just so massive you gotta want it.