A Little Bit of Crypto - I have been trying to figure out to "collision resistant" some of these standard hash functions are. It is a tough concept to get my head around. I figure...
The Windows 8 Store
Windows 8 Apps are sold in the Windows 8 Store. You use Visual Studio to upload your app package to the store. The package file has an appx extension. It needs a manifest. The appx file is really just a zip (compressed) file.
When you start out, you should reserve your app name in the Windows Store. The app will then get licensed to the user when they purchase it through the Windows 8 Store. Kind of reminds you of the Apple store for apps, right? Microsoft is coming a bit late to the game. Let's hope they can catch up.