Bluetooth on an Airplane?

bblazer asks: "Since I travel quite a lot, I am very familiar with the warnings about cell phone use on an airplane (could be bunk, but I still respect it and those around me). But what about using Bluetooth? I just got off an Alaska Airlines flight where the flight attendant said that we were not permitted to use any device that sends or receives a radio signal. I often use the bluetooth features of my PowerBook and Treo while onboard a plane (you can have the Treo on without having the cell phone on), or I set up a mini-network with others I may be traveling with. Could Bluetooth cause any problems, or is this something I need not worry about?"