Since Brett Avants brought this up, I thought I'd make a discussion group out of it. What games have you sold or given away in the past that you now regret parting with? I don't have many, but I do have a couple:
SPI's old WW 3 game. Let's face it, it wasn't very good--basically an adaptation of the WW II game system to a global map and a modern topic. Maybe it would have worked if the map was as big as the one for GLOBAL WAR. It wasn't. But there was a certain Cold War charm to the title (if anything relating to that topic can be said to have charm) and the coversheet to the flat box was just sooo cooool. I don't miss this title all that much, but since I've kept the old NATO game and the old RED STAR/WHITE STAR, I feel I'm missing something now.
AH's RICHTHOFEN'S WAR, with the maneuver cards variant from THE GENERAL. If I'm in the mood to play a World War I air game, it's usually Yaquinto's WINGS. But this game is great to get new players into wargaming (that marvelous map! those RED Flying Circus counters!). I'd forgotten that when I parted with this title. Ah well.