From a user perspective, this is just great – although it sort of kills the concept of “family licenses” we were used to in pre-App Store days.

As long as you make sure all the computers you’re willing to install apps on are your personal Macs (and you’re not trying to pirate apps that don’t come with proper receipt validation), you can purchase apps on your first Mac, and then pass them along to as many machines as you want. With the Mac App Store, as promised by Apple, you can buy apps once and install everywhere.