Wargameroom.com -- Real-time Internet Wargaming!: Wargameroom.com is a website devoted to the real-time play of sophisticated boardgames over the Internet. Programs now available for BtB, EE, H:RC, PoG, UF, WtP, and WW
I downloaded and had a quick play with the Europe Engulfed module. OK it has a somewhat 1980s interface, but it's pretty amazing to be able to play a complex game like this online at all.