Digiman.org
Wearable human/computer interface research and other related projects aimed at technologies related to wearable computers by Jeff Hartman.
Mel McGee's Wearable Site
describes a wearable based on a small off-the-shelf Pentium PC and self-developed software for e.g. sales force support.
TechWearable
Brian Rudy describes his self-made wearable with lots of photos.
WearComp.org
Steve Mann's somewhat chaotic personal page features his books and articles on the topic, wearable cameras, pictures from his worn camera, a movie and links to other wearables sites.
Wearwulf Project
Duncan Entwisle provides a complete hardware description on how he intends to build a wearable for less than $200.