I've spent a bit of time lately toying around with Battle for Moscow, a small and freely available wargame covering Operation Typhoon at the end of 1942. The game was originally published by GDW back in 1986 as a free giveaway to get people in to wargaming. I have no idea if it succeeded at that, but it did succeed as a fun and quick-playing wargame. I think you could probably finish this one in two hours or less, especially after you get to know the rules (not that they're particularly complicated).
As much as I like longer wargames (e.g. The Russian Campaign, maybe the greatest wargame ever), it is nice to have a game like this that moves quickly and can be played in a short period of time. Especially now that I have kids, time is very precious, and I can get the wargaming fix in a short time.
By the way, Victory Point Games recently published a new and cleaned up version of this one. And VPG has also published several other games by Frank Chadwick using a fine-tuned version of this system.