I have just received some WirelessUSB modules (samples) from cypress. They are cool because they even come on a pcb-module DIP-ready, so they are cool to start working with.
Inspired by your post and having seen reference to this previously I thought I'd pickup some samples to see if I could interface them with the Arduino.
Unfortunately I was told "Cypress is no longer sampling Devkits, Evaluation Board or Modules", so I was wondering how you got yours? 
--Phil.