Danjel van Tijn

It is not properly translated into English but it appears you can program the board with max/msp, flash and processing.

You can buy the boards from www.sparkfun.com

Just came across this today:
http://gainer.cc/

gainer-usb-board-you-can-program-with-maxmsp

I also want to know if anyone has used these microcontrollers......

Seems like this project was obliterated by Arduino. As for the 2007 opening post of this thread, as far as I can tell, Max doesn't program the boards but interfaces with it.

Gainer: usb board you can program with max/msp