The TTL shifter you linked to also inverts the data so this should work fine between an XBee and a PC com port. Once connected all you need to do is bring up a terminal program, connect to to comm port the TTL shifter/Xbee is pluged into and type in the AT commands.
Take a look at the schematics for the TTL shifted and the RS232 explorer board. The data lines (TX & RX) are equivalent but the explorer also has the 3.3V regulator and level conversion on the RTS & CTS control lines.
The Xbee is most happy with a well regulated 3.3V and a 1uF cap close to its Vcc pin. Look in the XBee document which also show that the only connections required are Vcc, Gnd, Din & Dout so you should have it covered.
Thank you for such a prompt response. I was trying to connect: XBEE>>SHIFTER>>PC with the regulated resitors and other components from the diagram link http://www.sparkfun.com/commerce/produc … cts_id=449 to regulate voltage. I ended up removing everything except capacitor, two resitors, 1 LED, and power. I powered the SHIFTER with the 3.3V out of the REGULATOR and wallah! I am even able to access with the X-CTU Software.