I learned from Eric Rumsey that the State Library of Kansas includes Wikipedia articles in their OPAC. Here are some examples: http://topekalibraries.info/search/awikimedia. About 15 minutes later I saw that Aaron Schmidt posted on the DCPL Labs site that in a recent survey 88% "of people responded that they prefer the content from Wikipedia in the Catalog." This is news to me - is this a fairly common thing these days? Would our cataloguing department kill me if I suggested it? :-)