Since I got Conflict of Heroes: Awakening the Bear! - Russia 1941-1942 for Christmas, I was looking for an online version. The one for vassal is not finished yet, but they have a really cool one that works with this ZunTzu app. The app also has quite a few other boardgames.
ZunTzu - The Online Boardgaming Platform
Look in the files section for all the current games supported. It doesn't have a built in lobby like vassal, but it does have built in voip. Check it out and if anyone wants to play CoH over it, let me know.