FCerqueira 

The DevPhoneToolkit for Windows Phone. Details at http://devphonetoolkit.codeplex.com/

The Windows Phone UpDown Control it is a effort that provides input values on a minimum and maximum limit.

The Windows Phone ZoomTextbox Control is an open-source project built on top of the Microsoft Windows phone 7.1 . It is a effort that provides input values on a zoom font size.