USB Zigbee Stick

you installed serial binding right?
I have a Linear HUSBZB-1 see the first post in this thread for a picture of it. It does zigbee & zwave I use both. It cost me about $30 usd

here is another link to a thread I started while trying to get mine working. and it includes many things to check and how

Here is a link where Lorenzo is trying to get his working - lots of great debugging techniques

Here is link to the zigbee binding thread (over 2000 posts) basically the encyclepedia of zigbee development