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I run the following Wireless Apps on my MacBookPro.

Wireshark Native to OS X - using the internal NIC
  kind of a pain to configure, but works great after the hassle

Wireshark in a VM (Personally use both Fusion and Parallels)
  works with AirPcap fine, love the .11n version
  I've still got to try the multi-AirPcap bit - works on my XP box so should be fine here as well

AirRadar
  NetStumber like

iStatMenus
 - for in header bar network info.

I've also tried Kismac, AP Grapher, WiFi Scanner (from WLANBook's Zaib)

Keith