Found this one on Boing Boing and I can just imagine the commercial with the never afraid of crass commercialism William Shatner saying …."Scotty … Can you hear me now?"
"WiFi Trek Badges" — The Vocera Communications System consists of Vocera Server Software, residing on a customer premise server, and Vocera Communications Badges, which operate over a wireless LAN (802.11b). The badge – which weighs less than 2 ounces – includes a microphone and speaker, LCD readout to display text messages, and an 802.11b wireless radio. It can be clipped to a shirt pocket or collar, or worn on a lanyard."