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"For about $10 million, city officials believe they can turn all 135 square miles of Philadelphia into the world's largest wireless Internet hot spot."

135 square miles is 3,763,584,000 square feet. Let's pretend each access point is giving us about 50 feet of range That's 7,853 square feet per access point, or 7,500 for easy calculations and to allow some slippage. So... around 502,000 access points. That's 20 bucks an access point even if you don't allow for wiring costs. But the article says "hundreds, or maybe thousands of small transmitters."

Am I woefully underestimating the range of each access point?