Please post the game(s) you would like to see made available for Mac/Apple computers here.
Remember, a game's developer/publisher has to decide if they want to make a game Mac compatible or not and/or add it to Steam. It is not Steam/Valve's decision to make. There is also no guarantee that the developer/publisher will read this thread or act on it.
It is recommended that you contact the developer/publisher of the game directly (by email or through their own forums) to increase the likely hood of that they will see it and know what their customers want.