GOG.com releases more and more Mac games!
I am a gamer and love to see more and more Mac games get released. What we do lack are the older games which arent available much for the Mac. And even if they were released, they are PPC only so won't be playable on the latest OSX 10.7.5/10.8.2.
However there is some light in the darkness. It seems that GOG.com (Good old games) is releasing more and more games for the Mac 
Even when making a free account there you get 10 games added on your account from which 9 are also Mac games and can be played on your latest OSX version!:Beneath a Steel Sky,Lure of the Tempress,Dragonsphere,Tyrian 2000,Worlds of Ultima The Savage Empire,Ultima Worlds of Adventure 2,Teenagent,Warsow,Ultima 4
Some of them really golden oldies!
Made a list here for some popular old games:
Cannon Fodder 2
Constructor
Defcon
Fallout
Fallout 2
Freespace
Leisure Suit Larry complete
MDK
Pirates Gold Plus
Postal
Postal 2 Complete
Screamer 2
Sensible World of Soccer 96/97
Sid Meier’s Alpha Centauri
Sid Meier’s Colonization
Sim City 2000
Simon the Sorcerer 2
Spacechem
Syndicate
Theme Hospital
The Feeble Files
The Bards Tale
Happy gaming!