Got this one at Maker faire as well so I wrote some code to play with it. Charlieplexing is kind of annoying! Repo though is here:
https://github.com/ChuckM/tinyduino-circle-led

--Chuck

So I'd like to stack a tiny-duino, a proto board, and a LED shield. I need to get a lead to the Analog in pin. But the prototypes shields don't have a connector on top and bottom like the Comm board does.

So the link on the product page for the 7-segment shield tutorial is broken. It points to the LED shield. Anyway I wrote one and leave the link here for anyone who wants to use it: https://github.com/ChuckM/tinyduino-7seg

--Chuck