Yahoo just posted this article. Cablevision rolled out a wifi network in part of NY. Free for Cablevisioin subscribers, but not open to others. Hopefully they really get good response and look to roll this out further. It'll put pressure on competitors to do something similar.

There's even a page on how to connect your Blackberry.

" Cablevision Systems Corp. said Thursday it has finished the first phase of its wireless network buildout in New York and remains on track to complete the project in two years.
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The diversified cable operator is offering the WiFi service at no charge to its 2.4 million Internet customers at speeds of up to 1.5 Megabits per second, similar to DSL at home.

The company currently doesn't have plans to offer the service to non-subscribers....."

Cablevision completes first phase of WiFi buildout - Yahoo! News

The service website with map:
Optimum Online - My Services - Optimum WiFi

Blackberry instructions:
Optimum