Mega Drop-down in Drupal, is it doable in Seven?

I love the look and feel of mega drop-down menus, but the Drupal menu system does not have an interface that facilitates grouping of links within menus, and it's even more difficult to throw HMTL into the menu that isn't part of the list of links.

I would love to be able to have a primary menu like this: http://demo.yootheme.com/ without having to create a handcoded php-block or having to resort to a custom module that pulls views into menu containers. Is it possible in Drupal 7, or does anyone have a bright idea that makes this doable?