Q: I keep hearing about the FCC and regulations. Where can I find out more?
A: The Industrial, Scientific and Medical (ISM) band, which WiFi is part of, falls under the Federal Communications Commission's Part 15 Rules.
www.fcc.gov
An excellant summary of the Part 15 regulations can be found at:
http://www.lns.com/papers/part15/ . It was written by Tim Pozar, one of the founders of the Bay Area Wireless User's Group and a broadcast engineer.