Very cool, although not sure if it's unique ... Maybe by being an Arduino add-on, but there have been other DIY 8-bit consoles (here's one: http://www.coolcomponents.co.uk/catalog/product_info.php?pro...).

This was impressively polished, it really shows that the author has been around a bit. :) I found the lack of any more concrete specifications a bit annoying, but maybe I just failed at locating information about e.g. what chip powers the board.