For those who haven't yet caught up on the podcasts, Rex and crew discussed this very topic a few months back.
To my way of thinking, there's very little upside and huge potential for abuse.
Sure, it would be nice to get lunch with the "wave of your hand", but what do you say when the boss has activated the tracking device and wants to know why you and a co-worker spent nearly all of your lunch in the broom closet? :-)
Or worse, what do you say when they question why you spend your time away from work associating with groups your company finds objectionable-and reports you to the government?