Zigbee/Xbee modules available from Digi work on 3.3v and are difficultto interface to a controller. This Zigbee/Xbee Xplorer Serial?is verysimple to use and using this base board you will be able to connect the zigbeemodule directly to the PC.
You can also interface the Zigbee/Xbee module to microcontroller forwhich you will require a MAX232 IC in your circuit. All you have to do isprovide a 9-12V AC/DC supply and you are ready to go.
You can use this module for Xbee Series 1, Xbee Series 2, Xbee PRO aswell as for Tarang Modules.