GOG announced that it would begin offering Linux versions of some of its games this fall. See the full story on their website.
This is great news for gamers as it gives more choices on which platforms to run games. Mac games started appearing on different digital distributors sites including Steam, GamersGate, and GOG a while ago. Now GOG will join Desura and Steam in offering a 3rd platform choice for gaming.
By supporting games in native environments, distributors make it easier for people who do not run Windows to have fun with PC games without emulators or virtual machines. More choice is better for everyone. It is one more reason PC gaming continues to thrive.