To be sure, Mountain View -- smack dab in the middle of Silicon Valley, with high scores for laptop usage, per-capita income, and tech savviness -- is hardly your typical mid-American town. Still these are impressive, if not startling, numbers.

"If somebody comes up with a proposal to create a Wi-Fi bubble over the city at any time in the next nine months, we would be free to take them up on the offer and do that," Houston Mayor Bill White told the TV station.

OK, that last comment was probably delusional. Houston and Mountain View, in fact, represent the two poles of muni Wi-Fi expectations and reality. Many observers are starting to describe a two-tier structure in which smaller, more contained communities like Mountain View (and Corpus Christi, Texas, Apple Valley, Minn., and Lafayette, La.) can afford to build and run Wi-Fi networks while major metro areas like Chicago and San Francisco find the costs and the engineering scale prohibitive.

Many of these smaller, less-publicized networks will be aimed at unglamorous city and regional services such as public safety and utilities, rather than blanketing the city with free high-speed access or bridging the digital divide.

Beyond the fate of EarthLink, says Ellen Kirk, the former VP of marketing at Tropos who left last year to form a wireless networking consultancy, "The bigger question for me is, What does this mean for the big cities? If you're a midsize city of half a million people or less, you can wrap your brain around a smaller service provider that understands how to put a wireless network up for video surveillance or traffc management or meter reading. You can do all that math on a single piece of paper."

"The projects where you can draw a shorter line between the network and the applications and the benefits, those will be fine," adds Tropos CEO Ron Sege. "If you're trying to build a network across a city the size of Atlanta, to be used for a whole host of applications, well good luck."

Anthony Townsend, research director for the Institute for the Future, has called muni Wi-Fi "the Monorail of the decade" (thanks to sharp-eyed San Francisco wireless activist Kimo Crossman for passing on this quote). It's a keen analogy, in that monorails as a futuristic solution to all urban travel ills never got off the ground, so to speak. But the technology and the concept of monorails have found their way into viable, cost-effective, and heavily used light-rail projects around the world.

So, while the land-rush era of municipal Wi-Fi is definitely over, the real-world laborious task of building workable networks with practical applications and viable cost structures in midsize and smaller towns across America is just beginning. Expect this phase to be longer-lasting.

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