Slashdot linked up news of the development of a camera system which appears to help folks with minor dementia remember things. The camera is worn by the person in question, and it takes a special stabilized photograph of the person's surroundings every 30 seconds. The pictures can then be uploaded to a playback device, which the person can use to review what they did that day. Studies are showing this seems to significantly improve recall in test patients.

Personally, I think it'd be pretty useful in bars too. At least then you'd know the exact sequence that lead to your losing an arm in a "coyote" encounter.