I have a pbp running on my wiki.
We are using an outside die roller and the wiki has email notification and/or an rss feed.
I had six but the guy playing the hocus bailed. After being convinced of being able to handle larger groups in Pbp I'd like to add a few more folks. If you don't mind what we've established in the world so far. It's not as fast moving as the ones here and there's been a pause over the holiday. We're mostly looking at at least once a day posts. But I'd be willing for it to be faster depending on demand.
Anyhow, if you're interested, let me know and I'll give you the wiki password.