Steven Levy of Wired has this article on Google's Glass Project, a set of glasses-like devices worn by a user (picture the visor Geordi wore on Star Trek, just not as awkward looking) that would provide all the benefits of having a cellphone without the need for a cellphone. On top of that, it would probably reduce your chances of walking into a streetlight while doing so. Needlessly to say, I wants.
The concept video for the Glass project concentrates on the cool things you may do with it one day -- create instant contact with friends, monitor feeds about weather and other info, get information about a subway station out of service, receive turn by turn directions on the way to a destination, snap a picture by command, even find your way to a certain tome in the labyrinthine Strand bookstore. Everything works perfectly because, well, it's a concept video and not a depiction of something that's actually perfected. But Googlers have been testing prototypes and have already solved some (not all) of the challenges required to make this real and feasible. (In other words, this is more grounded than the Apple's famous 1987 Knowledge Navigator concept video -- which, although way premature, is looking prescient these days.)