Michigan Library Consortium uses Second Life as training location
I saw this story in the Lansing State Journal online edition: Second Life brings virtual, real life together. http://www.lsj.com/apps/pbcs.dll/article?AID=/20070308/NEWS03/703080351/1004/news03.
They also had a virtual party to celebrate their new eLibrary gateway: http://www.mlcnet.org/cms/sitem.cfm/news__announcements/mel_remix/.