Not yet, I'll give it a shot too.
Is the 3.3V UART (the one next to the ethernet jack) indipendent from the pin 2 and 3 in the Arduino breakout or these pins (2 and 3) are simply connected to the TX and RX of the 3.3V UART?
If they are indipendent it should be ok, otherwise I should have issues if I use the pin 2 as an HW interrupt and if it replicate the RX data flow that is used by the Xbee on the 3.3V UART...
Does someone know exactly how the 3.3V UART works and how it is "accessible" though pin 2 and 3 in the Arduino breakout?
Thomas