Please note that just because whitehouse.org is not representing an official branch of the government, they are still pretty damned funny. Please see: Terrorist Reading Lists. [ thanks erica ]

But what if I wrote a book on quiddich... what's that DDC?
Let's not forget that old favorite, faceted classification. They use it on the web, you know.

Then there's the Weine System, an adaptation of the DDC for Judaica. See also David Elazar's Classification for Libraries of Judaica. Dewey, sometimes accused of anti-semitism, files all Jewish books under 296.