Bluetooth
The corollary to Clarke’s Law (“any sufficiently advanced technology is indistinguishable from magic”) is that any technology distinguishable from magic is not sufficiently advanced. Bluetooth is not sufficiently advanced. Yet.
I came home tonight with a relatively simple task - get a Sony Ericsson Bluetooth headset working with my laptop, and hopefully get Skype up and running. Bluetooth sounds simple in theory, right? Your headset and your laptop talk to each other, the laptop (which should have all the brains) discovers that the headset provides the Headset service, and pairs with it to use that Headset service.