Penguin and I would both like to know this. Why can I sniff 802.11g with my 802.11b card? I need to look again, maybe it’s only seeing the headers of the packets. I already know they do use the same frequency, but the encoding is different. Since they are a little different in how they encode things you would think that a B card could not sniff G, but I know for a fact that my B card in my laptop can sniff traffic from my G card in my desktop to my G router (I just tested). Maybe someone else could enlighten us to why this is so.

Edit: By sniff I mean see data packet (emule in this case), not just find WAPs.