The Scientific American Article describes one application of Wearable Computing: Overlaying contextual information over normal vision.

Diploma thesis which discusses conceptual and real-world applications of wearables as well as social implications. Also describes a prototype implementation using a Xybernaut MA IV.

Somewhat critical overview article from Wired featuring the oldest wearable computer (1981).

Overview of gesture recognition and force feedback for switches, screens, and games.

Journal on ubiquitous computing. Often features free articles on wearables.

The article, in principal focused on telepresence robot control, gives a nice overview on wearable computing and augmented reality on its first thirty pages and later on goes into detail on possible human feedback channels. [PDF]