HEX: Tales of the Hollow Earth PBeM
The archives for the game are public, so you can read messages and the like, but you can't post, nor can you access the Files section of the website. Anyone interested in playing the game can sign up for the game (it's membership approved) and get involved. Would love to see a few more players in the game.
Dinosaurs, ape-men, and ancient ruins...oh my! :)