ISM Bands
The industrial, scientific and medical (ISM) radio bands were
originally reserved internationally for non-commercial use of RF
electromagnetic fields for industrial, scientific and medical
purposes.
http://en.wikipedia.org/wiki/ISM_band
Netstumbler 802.11 Discovery Utility
http://www.netstumbler.com
802.11 b/g WiFi Channels
In the United States and Canada there are 11 channels available for
use in the 802.11 b/g 2.4GHz WiFi Frequency range. This standard is
defined by the IEEE.
http://www.moonblinkwifi.com/2point4freq.cfm
20 Myths of Wi-Fi Interference
This article discusses 20 misconceptions surrounding wireless
interference and how it affects Wi-Fi networks.