The Mac App Store has opened. If you go to Software Update on your Mac, you can download the latest version of OS X. This update includes a shiny new app on your dock called the "App Store." Don't get confused, this isn't the iOS App Store on your iPhone; all of these apps are Mac-specific apps.
While the Mac App Store does bring many great new apps for the Mac, many iOS apps that we all know are also available through the Mac App Store. Specifically, there are many popular games from the iOS App Store now available on the Mac. The new Mac releases of these games are basically fullscreen versions with some added features and content.
And yes, you can now play Angry Birds in full, HD resolution on your 27-inch iMac...