Somebody reports:BR "It is a stumbler program for Mac OS X. It is a beta but I have had no problems with it. It produces a log that came be saved to disk. To my knowledge it is the best stumbler for WiFi for Mac OS X out on the web (and it's free.)"
Go [http://www.macstumbler.com/ here].
Edited by Synthogen: "There are a few minor bugs with it. One such bug is the inability to added spaces in the comments field; you must enter underscores instead of spaces. Second, I don't believe there really is any other Mac OS X stumbler, everything else is for UNIX."