I don't get as much time as I want to play computer games, but I am quite a game lover. One of my favorite computer games was SSI's Panzer General, and its cousin Allied General. I felt those games struck the perfect balance between complexity and fun.
So I was interested to read on Greg Costikyan's PlayThisThing that somebody has done a "fan remake" of Panzer General, called PG Forever. There's a long and detailed description of the PG Forever work in this forum post. The game is apparently available from the developer's website.
If I get some time (hah!) I'll give the game a try. If you've tried it, and have feedback, let me know!