Few days ago I found AirGrab WiFi Radar(have you heard about this tool?), it's a program to display information about Apple Airport base stations and other WiFi (802.11b/g/n) wireless access points. Using this tool you can determine most popular WiFi channels and select optimal channel for your WiFi network.
I think it 'll be helpful to all... (btw, it's free....)
U can read more information on their site airgrab.com