AVR-Chat

> that would get me a third, but isn't the i2c port the same pins as the
> second UART?

Had to look at the pinout, haven't used the 128 in a while. No, i2c/TWI 
are pins 25 & 26, UART1 uses pins 27 & 28. You'd use the same i2c-bus to 
communicate with both slaves.