XBee Shield for Arduino
Easily add an XBee wireless module or other XBee-footprint device to your Arduino project with this great value XBee Shield for Arduino from PMD Way.
The shield arrives fully assembled and ready to use. It contains an onboard 3.3V power supply for your XBee and a convenient system reset button.
Furthermore there's a switch to redirect your Arduino's UART between USB and XBee, so you can upload new sketches to your Arduino without removing the shield. Win-win!