Would you wear a computer? I'm not sure I would. Except for maybe my wrist watch, cell phone, pager, oh, and the keys to my car.How about one which had a 600x800 eyepiece? or one that had an audio earpiece/microphone? Seen anyone with a phone and ear microphone lately? (they really work well - I tried one).
There are research folks all over the country (and world) working on wearable computing platforms. Some are pretty innovative. They include thinks like cameras, microphones, GPS receivers, accelerometers and IR sensors.
The notion of "context sensative computing" is often connected to these platforms; For instance, the camera will "recognize" a face and put info on the screen about the person. Or the GPS notice what building you are in and guide you to the office you or looking for. Or the bathroom. Or the nearest printer or coke machine. Seems dumb on the surface, but I'd like a cell phone which would tell me how to get out of a building during a fire.