Mandolin Cafe also has "Eye Candy" pages with many examples.

John Hardly...The side soundport is a sound hole in the upper bout intended to direct some sound to the player's ear and seems to give the instrument a bit more "dimension". Lots of one-off builders are doing them, and I've also got a guitar with the feature. Also serves to collect drool and crumbs, and eject picks.

Peace, Mooh.