At the MWC 2008 - Mobile World Congress - that is currently taking place in Barcelona, there are many hot new products being presented, and one of them is the Sony Ericsson MBW-150.

Also known as a bluetooth watch, the MBW-150 has a small OLED screen that displays information about the callers, and music related stuff.

As for using the watch to actually control the cellphone, like people used to do on old-school movies, in this case it can be done to adjust the volume, and taking care of the calls.