I've just jumped into a couple of games, and boy does it feel good! I'm doing a couple games of Combat Mission 3: Afrika Corps (CMAK) and a scenario from Squad Battles: Vietnam.
I haven't gamed CMAK against a live opponent before, and these two games aren't big ones, just enough to get my feet wet so I can play on a more competative scale. I like CMAK for what I've played of it.
I have played Vietnam against live opponents. The game I'm playing is for points and also to get me out of the Blitz's bootcamp level. The scenario looks good, but I do have issues about it reacts to PbEM play. You have to jiggle it here and there to get to not crash on the Vista OS.