In addition Microsoft will offer a separate desktop app store with a different set of rules focused on security and compatibility requirements.

BBC: Minecraft screenshot

Apple has its own app store for the iPhone and now has a Mac App Store for its desktop apps.

FORBES: Pokki Brings Mobile-Style Apps To Desktop PCs

Today, over 12 million users enjoy the convenience of Splashtop Remote Desktop, named to Apple App Store's Top 25 Best Selling iPad Apps of All-Time.

ENGADGET: Splashtop's Configurable Shortcuts & Gamepad feature lets tablet users create virtual controls and more

The Adobe Revel 1.5 desktop app for Mac is immediately available in the Mac App Store and the apps for iPhone and iPad is on the iTunes App Store.

ENGADGET: Adobe Revel 1.5 released with new UI, text captions and auto-syncing albums

The Altec Lansing LIVE Controller apps for iOS, Android, and Desktop are available for free download from the Apple App Store, the Android Marketplace and Altec Lansing's website respectively.

ENGADGET: Altec Lansing Live 5000 WiFi music system makes its debut, plays nice with Android and iOS (ears-on)