How to view channels used by other local wireless networks?

I use a wireless airport network in my office, with my Airport Express (802.11g) base station about 10 feet from my iMac. I get a lot of interference (from other networks or cordless phones) and despite interference robustness being on, my airport signal gets dropped fairly often -- and with it, I lose my Internet access and wireless printer.
There are about 15 other local wireless networks (owned by other businesses). I thought I might improve my interference robustness by switching my wireless channel to a channel used by the least number of other networks.
Now, I seem to remember running into an (Apple) app somewhere that showed these local wireless networks with their channels. But now I can't find it again, so I can't tell which channel is least used. I hope someone can help me find that app or functionality again!
Thanks.

Thanks for the suggestion; I checked it out and found some questionable reviews on VersionTracker for iStumbler so I'm hesitant to jump right in (does it still fill up the Console log?)
In any case, I seem to remember finding channel information using some other application or preferences pane or something already on my system, but now I can't remember where. Is there any app that comes with OS X that shows channels on local wireless networks? I can't find this feature in Airport Utility.
Thanks for any assistance.

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