I talked about theming.
UPDATE (2007/09/01): … and have been videotaped in the act.
UPDATE (2008/03/22): The project code now lives at drupal.org and is called taxomenu
Example code is attached here (the module) and here (the theme). I will still have to find a proper name for the module that mashes taxonomy, menus, and panel pages. In the tarball, it goes by the name of navcontrol. But maybe this is just because of the initials ;-)
For a quick glance, the slides are here: