Parallax, Inc:

BASIC Stamp Starter kits    

Propeller Proto board

USB2SER Device for AppBee-MOD USB

Prop Plug for AppBee-SIP USB                      

StampDAQ Software   

MaxStream:

XBee information       

X-CTU Software          

White Papers                      

DigiKey:

Search Digikey for "XBee".  XBee modules, development  kits and PC interface boards.   

Surveyor Corporations:

XBee Robots with Cameras    

Miscellaneous:

StampPlot, Graphical Data Acquisition and Control