it's starting to very slowly... but will eventually start to change a bit... plus, if you have an intel mac, just run PC games in bootcamp. I do that ALL THE TIME with my macbook pro, and they usually run just great. There's only been one game that I've tried that hasn't worked at all (granted I was trying it with the first version of bootcamp..I should see if it works now that the driverrs have been updated several times) I've been playing all the latest PC only games on my windows partition with great results.
anyway... for mac, if you put in a cd or dvd it will mount on the desktop. You just double click on the icon that comes up and there will either be an installer, or it will say somewhere in the window to drag it to your applications folder... The applications folder is at the root level..so if you open your hard drive from the desk top, there will be an applications folder (hint: if you drag the folder to the dock right next to the trash it'll be really quick and easy to access by clicking on it there (also right/control clicking will give you a list of applications. You can also make the game easier to find by going to where it is in the applications folder and dragging it to the dock... then you just click it in the dock for it to open.