NBuilder with Prototypes

I've created an extension method for NBuilder's SingleObjectBuilder. This allows setting property values based on a prototype. A typical usage would supply an anonymous object as the prototype...

            var prototypeStyle = Builder<Subject>
                .CreateNew()
                .Prototype(new
                               {
                                   Id = 11,
                                   Name = "prototypeStyle",
                                   ParentName = "Dad"
                               })
                .Build();

I like this style because the property name/value pairs are easier to see.

You can find an implementation at http://code.google.com/p/nbuilder/issues/detail?id=78