Watches are essentially the only wearable technology adopted by the masses. You could argue that plenty of athletes wear iPods, but a watch is something worn by high schoolers and geriatrics alike.
So it makes sense to build more functionality into watches. The HD3 SLYDE timepiece, designed by Jorge Hysek, is a little too much watch for me, but I like the direction it points towards, with swipe-able screens (think Apple's Spaces) so you don't need to cram too much information on one screen, or fiddle with tiny buttons to access others. Globetrotting businesspeople would surely appreciate swipeable time zones, and I'd love to be able to quickly switch screens to check the weather or upcoming appointments, presuming the company could work out a hassle-free sync.
The video's a bit cheesy, but should give you the idea: