I used it extensively for my latest academic project. I managed to control Ableton Live (with Max4Live) and send messages to the board (switch LEDs on/off). It worked fine with my Arduino Duemilanove but for some reason it did not work totally with Pro Mini's. Yesterday I tried a Pro Mini (3,3V) and could not get the digital inputs work, even though the analog inputs worked fine. By the way, I used it with a Bluetooth Mate module. I even checked if the Baud-rate matches.
Apart from that, great job, thanks guys!