dragoon | 11:31 PMnym's earlier entry on StartleCams reminded me of something. A fair number of scientific advances were prophesied in science fiction (I keep on forgetting to read Thomas Disch' The DREAMS OUR STUFF IS MADE OF), and Warren Ellis' Transmetropolitan mentioned something similar back in the 90s.
Spider Jerusalem, the series' grumpy antihero journalist, wears camera-shades that happen to capture evidence of an embarrassing drunken night due to anti-assault defenses. There aren't many devices out there that provide this kind of functionality, but recording is becomming a much more commonplace activity. In the 90s there was a kidnapping/murder where the victim had a casette recorder on her, and without the murderer's knowledge, captured her pleading for life. The police found the tape later, and used it in court. This was turned into a Law & Order episode. More cases of crime documentation from victims with webcams, cellphones or wearables are coming.
On a cheerier tone, Transmet has SPKF feedsite (think 30th Cent. website) listeners that provide audio/video to their audience via attractive electronic and harness combos. Again, something that could be done today. A lot of sci fi (and its hipper, somewhat brain-damaged cousin cyberpunk) skips right over wearables to cybernetic implants, but who wants to go under the knife every time a faster model comes out?