I've had several (although none were played by post on ENWorld, no). "A Bad End" was a long play by post, using a non-D20 rules system. It lasted more than a year, before the BBEFs won! There was another short adventure with one of the same PCs. I think there was also another one, but I can't recall what it was, right off hand...
Oh, yeah! It was a Buffy The Vampire-Slayer game, that never really took off, due to a lack of attention from the GM. Buffy: The Awakening.