The other, older, founding operator of PBM games is the wonderfully named Flying Buffalo, Inc., who are also the publishers of Tunnels & Trolls.
>Play-by-mail (PBM) games are a rapidly expanding realm of the gaming world.
I somehow find that hard to believe.
The PBeM server on gamerz.net has a good sized list of games they host. http://www.gamerz.net/pbmserv/ (I used to play a bit of Firetop Mountain long ago - http://www.gamerz.net/~fm/ ). Note that this is a very old server and I haven't checked if anything is still running.
You can already play IF over the web and gopher.
COLLECTOR - Not only do you enter modded Breyers in online horse shows, you even have your R card. Next up: scratch build.
ENTREPRENEUR - Thanks to optimising tax breaks (and a partner from a good family with a day job), you live up to the title of the book Losing Less Money Raising Horses.
COMPETITOR - You marry your vet. This just makes it official, the two of you already spent nearly all your waking hours together anyway.
SOCIALIZER - You wish to make friends so you can collectively flame the benighted heathens who use a different colour tack or prefer a different breed.