The site navigation utilizes arrow, enter, escape, and space bar key commands. Left and right arrows move across top level links and expand / close menus in sub levels. Up and Down arrows will open main level menus and toggle through sub tier links. Enter and space open menus and escape closes them as well. Tab will move on to the next part of the site rather than go through menu items.
August 28 is Race Your Mouse Around the Icons Day. It has been recommended that you pursue this pleasure while you're waiting for whatever it is you're waiting for to come up on the screen.