I read it first on Librarian in Black but liked the coverage of the Mercury News. The San Jose Public Library decided to not add filters to the public library computers after a year and a half of debate. One of the points made by the article is that startup costs to add filters would be about $90,000 with annual maintenance costs of $5,000. You can read the final policy statement here (pdf). In includes the fact that, out of almost 1.4 million computer login sessions at SJ Public Libraries (excluding the King Library), library staff received two complaints of lewd behavior and only one complaint to staff about pornography viewing. The King Library, the main library, had a similar number of login sessions and 14 complaints about pornography viewing.