Best thing of all, it doesn't expose the interface to meddling users - and keeps it all in the code - makes me feel like a developer again!
Paired up with posts 2 posts this makes a REAL CMS out of wordpress - good job you guys! I mean, it was a CMS before, none of these things are new, but you made it EASY to accomplish and give a unified interface.
Best thing that could happen now is for the two plugins to merge and offer a single interface and documentation - will reduce duplication that currently exists between the two.