Bluetooth has its uses for pairing devices, such as speakers to computers, speakers to phones, headsets with phones, transferring of files, etc, but at the same time it drains a fair bit of battery, and sometimes we end up forgetting to turn the Bluetooth connection off after we're done with it. Granted this isn't exactly a major issue, but in an effort to help users conserve as much battery as possible, Apple has filed a patent that suggests a method that would turn off Bluetooth in multiple devices with one button.
Ubergizmo, Apple patent looking to simplify Bluetooth power states to conserve battery