Create checksums based on URL content?

It might be interesting to do bulk counts of the URLs themselves, but I
agree that fetching the pages is a terrible idea.

Regards,
John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies",
Information Superhighwayman wanna-be, http://iecc.com/johnl, Sewer Commissioner
"I dropped the toothpaste", said Tom, crestfallenly.