I just received my Arduino and Rainbowduino today and wanted to test some simple programs. So I hooked up the Rainbowduino to the Arduino and tried to load a program.
Sadly, all I got was: avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude: stk500_recv(): programmer is not responding
The Arduino by itself works. I was able to upload the blinking light program and that runs just fine.