This simple to use, but effective unit combines the power of the standard USB to serial adapters with the Xbee line of modules. Using a 500ma 3.3v Vreg this unit is able to power the Pro series of modules as well as the wifi breakouts!
Simply plug in a USB Mini cable and this unit will give direct access to the Xbee programming pins as well as the serial pins. It is also handy for interfacing 3.3v GPS modules, or other units that require low voltage serial communication.