One of my favouritest ever computer games is Talonsoft's East Front II. Although it is now getting quite old (seven years?!) they certainly got it right as a good computer sim that comes closish to the Squad Leader experience. Very good fun with another serious gamer if you have the time to play through a game, or meet often enough to enable enough frequency of turns that the game won't lose momentum. It is involved enough that you don't want to wait too long between turns.
Anyway, Wayne and I are looking at playing it by email, now that he is connected. We are just working out the file protocols etc, and then I can look forward to the computer age's closest aproximation to the classic wargames experience without the downloading and mucking around with beta versions of simulation software.
9 hours ago