[Air-L] wireless sensor networks

Hi All: Does anyone know of any literature that addresses Wireless Sensor Networks from the perspective of what effects Ubiquitous Computing might have on humans and animals? I'm thinking here of both biological and psychological effects. I've been doing some research and have *only* come across extremely positive reviews of this technology. I'd like to read some other perspectives. (This question may link back to the radiation issue that was on the list awhile ago). Also, if anyone has some concise literature on WSNs and cost issues, I'd take that, too (e.g. the economics of who will be able to have such networks etc). Very Best, Sareeta