SportsPlug
Do you run a sports-based RPG? A game based on wrestling, soccer, football, or some other sport?
How about taking a look here?
The problem is, that although many of these games are PBeM, if it's rare that you have web access, rather than just email access, it's actually very hard to find one. It's not all that easy to find one looking for members even if you have got web access either - mostly you just come across list of links after list of links, and at least half the games are dead or not looking for members.
So, enter SportsPlug. Because the announcements here are posted by email, its a pretty safe bet that they won't be dead - at least someone cares about them enough to advertise. And if you choose you can have all the adverts delivered neatly to your inbox, to look for them at your leisure. Or if you prefer, you can look through them here. Come and look around!
Other ways to advertise on SportsPlug