So Paizo had a very active Play By Post board going on at their website: which is pretty much open to any and all RPGs. I'm participating in a WH40K Deathwatch game, and I'm running a COC game as well (sorry, recruitment is closed).
Of course a vast majority of the games are Pathfinder.
As membership is free I would like to invite some D100 compatriots over; perhaps we could introduce a little variety into the D20 landscape.
paizo.com - Online Campaigns