http://money.cnn.com/2010/08/24/tech..._tax/index.htm

NEW YORK (CNNMoney.com) -- Philadelphia bloggers were abuzz this week about a citywide move to crack down on citizens running a business without a license -- which includes any local bloggers running ads on their sites.

The weekly Philadelphia City Paper kicked off the kerfuffle with an article spotlighting several small-scale bloggers who were startled to receive letters from the city demanding that they shell out up to $300 for a license allowing them to operate a local business. One of the recipients had raked in a whopping profit of $11 over two years from his blog.

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This is kinda old but I ran into it again. Gotta love government don't you?