I'm pleased to announce a new version of the library that includes support for SoftwareSerial. For the majority of users on Arduino, with only one serial port, this frees up your hardware serial port for either debug or other uses. A big thanks to Paul Stoffregen (Teensy creator) for contributing the code for this feature. Please note this version needs testing, so please try it out and report any issues here. It was necessary to make a small change to the API to support this feature, which is described in this wiki
http://code.google.com/p/xbee-arduino/wiki/SoftwareSerialReleaseNotes The software is available in the downloads section
http://code.google.com/p/xbee-arduino/downloads/list Lastly, although SoftwareSerial has made significant improvements in reliability and performance over the years, it should never be considered as reliable as the hardware serial port, although it may work as well in many situations.
Andrew