Ok, a bit more about Yahoogroups.
Yahoo! Groups - Join or create groups, clubs, forums & communities
I have been running and playing there for years and I like it for the following reasons:
1. I can reply to it whenever I like. With players from Turkey to Europe, the Americas and Asia, we are posting nearly all day long, and rarely do time zones cause a conflict. This is the same with PbP, but online Maptools and such suffer from this.
2. I can reply from nearly anywhere I like. I use computers at my many schools (I teach at 5 a week) so it is nice to be able to read posts and reply from 6-7 computers a week. Again, PbP works well for this but not all systems.
3. I can reply by email, not by visiting the site. True, when I am posting from out of home, this is not true, but from home it is a huge time saver. No clicking endless links to read posts or move from place to place. It saves me tons of time.
4. File storage, polls, database, etc. Yahoo has some nice features to help with play. Granted they are not special as you can do these with nearly every other option, but it makes things easier.
A couple of my games. Here is my longest running game on Yahoogroups. A solid 8 years
Lyddas_Curse : Lydda's Curse
And another that will be looking or players in the next couple of weeks (4E Dark Sun)
DarkSun4E : DarkSun4E
Hope this helps, you are welcome to try out the Dark Sun game if 4E and Dark sun interest you.