Nuclex.Cloning (nuget): This is a C# based .NET 4 library that is used to deep clone objects, whether they are serializable or not.  It intends to be much faster than the normal binary serialization method of deep cloning objects.  This is basically just slightly tidied up code from http://blog.nuclex-games.com/mono-dotnet/fast-deep-cloning/  This library can be used staticly or injected using the ICloneFactory interface.
Keywords: clone|deepclone|copy