This works fine on my dev box. Here's the output from my NuGet package manager on a WP8 project:
PM> Install-Package NdefLibrary
You are downloading NdefLibrary from Andreas Jakl, the license agreement to which is available at https://ndef.codeplex.com/license. Check the package for additional dependencies, which may come with their own license agreement(s). Your use of the package and dependencies constitutes your acceptance of their license agreements. If you do not accept the license agreement(s), then delete the relevant components from your device.
Successfully installed 'NdefLibrary 0.9.0.1'.
Successfully added 'NdefLibrary 0.9.0.1' to Wp8TestApp.
What you're probably missing is to update your NuGet package manager to the latest version. Go to Visual Studio File Menu --> Tools --> Extensions and Updates --> Updates --> Visual Studio Gallery --> NuGet --> Update and finally you'll need to restart. The reason why this update is needed is that the NuGet version that ships with VS2012 RTM doesn't support WP8 since WP8 didn't RTM before VS2012 did.
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