Top 20 NuGet Windows Phone Packages

The project contains interfaces, and adapter and facade implementations of the interfaces, that mirror functionality in several classes in the Windows Phone 7.1 SDK. These interfaces and adapters can be used to increase testability when developing Windows Phone applications.
The MemoryDiagnosticsHelper made by Peter Torr!
Telerik Analytics enables easy application analytics in your .NET application.
ItemsControl providing 2d / 3d cover flows and other flow layouts for Windows Phone 7
The Scrypt (Silverlight Cryptography) library adds RSA Encryption, Decryption, Signing and Verification for Silverlight and Windows Phone 7. Key generation is performed asynchrounously so as not to block your UI. This library has been used successfully in Windows Phone 7 apps offered through AppHub....
API for sending push messages to Android devices using the Google Android C2DM service.
AgFx is a data caching framework that makes it easy to build data-connected Windows Phone applications.
Bindable application bar wrappers for Windows Phone.
A port of the SL.Phone.Federation library from the Windows Azure Toolkit for Windows Phone 7, improved with better databinding support. Includes working versions for WPF 4 only. Silverlight 4, WP7 and WP7.1 support coming in next version. <br /><br /> Changes since 0.9: - Refactoring of the control ...
Method Chaining base UnitTesting Extension Methods for Silverlight Unit Test Framework. This provides only single .cs file.
When you install the Windows Phone SDK this file can be found in C:\Program Files (x86)\Microsoft SDKs\Windows Phone\v7.1\Libraries\Silverlight however that doesn't make it very friendly when people open it without the SDK or you want everything in one place so this simple Nuget package solves that.
Controls for Windows Phone: WatermarkTextBox, WatermarkPasswordBox
a collection of utility classes which save you time and help you write testable wp7 applications
Library that allows you to fluently call restful services from WP7.
A flexible library aiming to help Windows Phone developers to have neat and native looking tiles for their apps and/or in their apps. Details at http://wptiletoolkit.codeplex.com/
VisualState Changer Behavior and DataContext method caller action for WPF, Silverlight 4 and Windows Phone 7.
VERY Compact UnZip library for performing UnZip of zip-files in Silverlight 3, 4 and Windows Phone.
Silverlight unit testing framework for Windows Phone 7
A NuGet package that allows other packages to execute some startup code in Silverlight for Windows Phone applications