Bookdog's Tag Cloud uses my replacement for NSTokenField, which I have named RPTokenControl after Robert Pointon's Tag Cloud NSView, on which it is based.
The download includes documentation produced with Apple's HeaderDoc. After I finished it, I realized why Apple seems to not use HeaderDoc internally any more. Oh, well. Next time I'll make my own. The download includes a demo project (also based on Robert's). The code you would need to include in your project is all in the subfolder RPTokenControlKit.
