I've still got my Super Smash Bros. Brawl retail displayer. I use it to store my "currently playing" games.
Also used to have an entire Xbox 360 retail demo display kiosk, but had to get rid of it in a move. Still have some demo discs from it though, that when inserted into a 360, will convert it to a demo unit with the only way to reverse it being a complete reformatting.