Russell Shaw is a specialist in mobile computing, telephony, networking and covers these fields regularly for numerous print and online publications. Russ writes the popular IP Telephony blog on ZDNet and contributes regularly to The Industry Standard blog as well. Author of seven books, Russ' latest book is Wireless Networking Made Easy.
John Yunker is president of Byte Level Research. He closely tracks emerging wireless technologies and their impact on consumers and carriers alike. Over the years he has written a number of major reports on technologies such as Wi-Fi, WiMAX and cellular technologies.
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I've been putting the new Canary Wireless Wi-Fi detector through its paces and it is clearly a big improvement over other Wi-Fi detectors. Still, I think it's just a bit too bulky to find its way into my pocket on a regular basis.
It's quite a bit bigger than it appears here:

A close-Up of the LCD screen:

It does provides a great deal more information than any other detector, like signal strength and SSID. And the device does a nice job of turning itself off to conserve power.
But the size is a sticking point with me. And the LCD screen desperately needs a backlight; and because the LCD is recessed you'll need direct overhead lighting to read the display properly.
Waiting for cellphones to offer Wi-Fi detection
The HP iPAQ provided the first glimpse of a handset that could function as a decent Wi-Fi detector. But we need more handsets to begin supporting Wi-Fi, despite carrier reservations. I was disappointed at CES to find that Blackberry still has no projected date for a Wi-Fi-enabled device. And although the Treo will have an "official" Wi-Fi plug-in later this year, I'm not hearing much enthusiasm from the Palm people regarding embedding the technology. Benq demoed a device at CES, but it wasn't ready for prime time.
So I'll keep waiting and, until then, will occasionally carry along my Canary Wireless.