AirCap

Capture 802.11 wireless networks traffic
AirCap is a wireless sniffer. It will capture 802.11 traffic when you are not associated to a remote wireless device. This tool will display the access points but also the stations connected to it.
Although all frames are dump to a cap file (which you can open with iptools or wireshark), for now, only beacon and probe response frames are parsed and displayed. A later version may include association and authentication frames.

You can use the wildpackets peek driver or the tamosoft commview ca2k.dll.

Source : www.fiberdownload.com