I knew for a long time that they overlap in frequency, but never knew the exact range. I recently bought a bluetooth headset for my phone, and some people have complained about hearing statics when I talk to them. I was curious if it’s because my 802.11b/g AP is getting in the way, so I did some look up:

Bluetooth: 2402MHz – 2480MHz
802.11b/g Channel 1: 2401MHz – 2423MHz
802.11b/g Channel 2: 2405MHz – 2428MHz
802.11b/g Channel 3: 2411MHz -2433MHz
…
802.11b/g Channel 11: 2451MHz – 2473MHz

(See the spectrum chart here for a graphical view.)

Well well, so it looks like there is no escape from Bluetooth if you’re using 802.11b/g… If you set your AP to channel 1, at least you avoid 1MHz of the spectrum