Over at Enworld, we've got a healthy living world going, and new players are always encouraged to check us out and join. You can find the forum here and the wiki here.

We've got over a dozen adventures running right now, and we've had something like 60 or 70 completed adventures in the three years that the group has been running. Want a proven, stable PbP environment for Pathfinder? Then come on over, because we'd love to have you.