The Generals HQ group up above in the Opponents Wanted section is a good place to start for getting in on a group.
To echo what kirk23 said, this is a good time to get into the game, or back into the game as the case may be. One of the biggest complaints from the EiA vets about playing this PC game version was about the pbem multiplayer mode problems: pbem bugs/crashes, limited admin capability to make some game edits, too long to play (no combined phases), etc. Most all of these are now resolved with the latest patch (in various stages of development for over two years now!) and the game is very stable. I think some are still waiting for an "official" final v1.08 patch, which Matrix intends to offer as a standalone comprehensive patch finally so players don't have to apply multiple patches, but really the latest v1.08.07 beta patch is for all intents and purposes final and playable. And, the latest patch has the updated user manual which now includes EiA strategy articles from the old General magazine, which should help newbies get up to speed.
The game still has some lingering bugs, the classic EiA map and force pools are still on the to-do list, some modest AI improvements and enhancements are planned, and the game editor and admin menu still need a few features added so we can start cranking out new campaigns. Hopefully Marshall will get to these when he finds time. Keep your fingers crossed!