I am a big fan of open-source software. I decided to make my mini-libraries, that I use for Windows Phone and Windows 8 development, available to everyone who would be interested. Both are basically a collection of useful utilities and components that I wrote myself or found on various forums and slightly modified. Source code is available on BitBucket and packages on Nuget.
My Windows 8 mini-library is best used with the WinRTXAMLToolkit that I contributed to once ot twice.
AutoCompleteBox for WinRT