Chad has created an incredibly simple and powerful (yes, both of those at the same time) plug-in.
You can start using it instantly, take advantage of its short-codes and settings to do a ton, and then extend and customize it with all kinds of filters, over-writable functions, and more. Simply a masterpiece.
On top of that, after registering as a paying member, I asked Chad a question about a feature I needed. Within hours I had code that it took me 10 seconds to deploy and did exactly what I wanted (registration using e-mail as username).
I'm out of superlatives. This thing is that good...
Only issue I can see is that Chad is not charging enough for it... :-)