blotunga: Obviously all the games which would run on modern OSes :/
Hmm with some of them, though, just because GOG CAN get a game doesn't mean that it SHOULD - check out the hidden-objects-paloosa that is the Strat First back catalog for a start...
I think the lists are mainly useful for when GOG is part way through a, say EA or Ex-Atari 'Retroism' batch of games and people are wondering what else might be in the pipeline although GOG obviously CAN deliver a delightful curve ball from time to time like releasing Aliens Vs. Predator or suddenly signing Disney, but that's all good!