I recently played the game
Amyitis (
Rules & Hint sheet link) for the first time, and I think it'd make a good forum game candidate. It's a game which can throw lots of options at you, but which you can plan a few turns ahead, so forum game is great for giving you the time to think about each move. And it's fun!
The game is about building the Hanging Gardens of Babylon. You do this by hiring various workers to do things for you, gaining resources and other things while also managing the caravan travelling around Messopotamia, bringing you upgrades and the plants necessary for the construction. The game is primarily a resource management game, with an emphasis on timing your actions to gain the biggest benefits and to limit opponents.
Any interest? I'll run it if at least three people want in. Note that I'm expecting first time players so don't worry if you haven't played.