http://arduino.cc/forum/index.php/topic,102960.0.html
posted source code and binaries to everything (it's attached, just extract the contents and read the readme.txt)
you can now communicate to multiple arduino's via pins 2 - 7, and if you wish, you can modify the ino file and add
support for anything else, like wpm or to read analouge data...
ok my led's pins 2 - 7 are waiting to be lit ....