Apple has, for a while now, had an automatic app download feature for users of their iOS platform, including the iPad, iPod touch, and iPhone users. Essentially how it works is that when a user downloads an app their iPod touch, if configured the app will then automatically download on their other devices associated with the account as well.
Users of the upcoming OS X Mountain Lion will now be able to enjoy the same feature. It works exactly how it does on iOS, when a user downloads an application from the Mac App Store on one of their Mac’s, it will automatically download the app on all other Mac’s associated with the same account.
OS X Mountain Lion is set to be released late this summer for users of Mac OS X Snow Leopard and Mac OS X Lion. Pricing is currently unknown.