http://www.parallax.com/Store/Microcontrollers/BASICStampModules/ta...
The Memory Stick Datalogger is a USB host bridge which allows you to connect a USB mass storage device, such as a thumb drive, to your BASIC Stamp, SX or Propeller Microcontroller. The Vinculum Chip on the Datalogger handles the file system of the Memory Stick so that you can share the files with your PC using simple serial commands.