Hey, guys --
Just to touch on the subject of the velvet curtain? I don't personally understand why Drumm's idea didn't catch fire:
http://groups.drupal.org/node/716
Specifically, the use of a microformat. If one were drafted for use in conjunction with themeable functions, it would be a simple thing to write a module that would expose every themable function in a given Drupal installation.
Granted, this could probably be accomplished by pouring over the code by hand and looking for such instances, and people might blow it off like they do thumbnails for themes.
But it would simplify things and make Drupal slightly more semantically aware, facilitate SEO, etc.
-Max