Nowadays I see a lot of people walking/driving/working with wireless Bluetooth headsets attached to one ear. Back home, you can't use a cellphone while driving, and in California, the same law is going to apply in 2008.

One day, we're all going to look like Borg: each with our own Bluetooth headset attached to our ear, blue lights flashing. Maybe our cellphones/PDAs/Blackberrys will become optic/neurogenic implants, attached to our eyes, so we don't even have to carry anything physically. Hah...

Speculative science-fiction.