Functionality that needs to be in TAPIr but is not at the moment:
- The ability to use Drupal's tablesort. We'll need this for Übercart, so you can bet it'll make it in here.
- The ability to pass other arguments for use by theme_table or whatever theming function you choose. This is necessary as well, and will make it in, I'm just trying to decide if that data should be passed as arguments to the builder function (seems likely) or in the hook_table_settings.