I'm not going to be a lot of help here but .. me too!
I've brought a Colorduino from good ole eBay as I've been playing with shift registers and LED cubes up to now and thought the RGB Matrix looked to be a good thing to move up to next, but there is very little help with it.http://www.ebay.co.uk/itm/160956072486
I have managed to change the default demo programming on it from the one second red, blue, green flashing to the demo plasma sketch and I even managed to figure out the white balance by changing the plasma code slightly, but thats it. All other demo sketches I've found over the past few days all fail to compile.
It is possible to write directly to the unit as I've not got it wired as a slave (that was partly the appeal of this board), I just used a TTL to USB cable:http://www.ebay.co.uk/itm/261101529602
I would love some help on this too.