This project is a modified version of the code provided on CodeProject with the article Drag and Drop Items in a WPF ListView, written by Josh Smith. Out of a desire to use it for some of my projects, I've repackage the code as a library targeting version 4.5 of the .NET Framework, and put it here on GitHub.
The project is available on NuGet here, and on SymbolSource here. For more information about the project and how to use it, please refer to the article on CodeProject.