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. - http://www.melmcgee.com/wearcomps.html
Wearwulf Project - Duncan Entwisle provides a complete hardware description on how he intends to build a wearable for less than $200. - http://www.btinternet.com/~family.entwisle/personal-blog/static/project-wearwulf-main.html
TechWearable - Brian Rudy describes his self-made wearable with lots of photos. - http://www.praecogito.com/~brudy/techwear.html
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. - http://www.wearcam.org/