I guess you'll find that interesting too: it's just an overview of topics for diploma thesis at the ETH Zurich this summer. It's simply amazing how huge and broad the field of wearable computing is today. And I'm sure that it will grow, and grow, and grow...

Examples from the full list:

IFE-01 Influence of magnetic disturbances on orientation tracking
IFE-02 Navigating and browsing online manuals by gesture recognition 2
IFE-05 Using Ultrasound for Hand Localization
IFE-06 Supporting Context Recognition using RFID Technology
IFE-09 Hear what we eat
IFE-12 Battery Capacity under complex Load
IFE-27 Body Area Sensor Network, or
IFE-28 Artificial Evolution of Hidden Markov Models for Context Recognition

And much more. There is still a lot to do...