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Kismet, unlike NetStumbler, is a "passive scanner". This means that instead of probing wireless devices for information, it sits and waits for the information to come to it. This is generally the preferred method because it is more difficult (if not impossible) to detect a passive scanner interecepting network information.
Kismet is somewhat difficult to install, if one is not used to Linux/*BSD, but there are tutorials readily available. For FreeBSD users, there is a package in ports for kismet.