There has been this really interesting discussion in the ALA group at LinkedIn recently about how to monitor the reputation of your library in "cyberspace." People use the following tools:
Dogpile -- which captures the ones above and MySpace, FaceBook, LinkedIn, YouTube, Flickr, and Twitter
LinkedIn application called Company Buzz.
Emily InLow-Hood mentioned that Beth Kanter had some good ideas about this as well. can you think of any others?