The Association of Research Libraries (ARL) has had a series of New Measures Initiatives going for years. Finally, somebody is tracking the various efforts on behalf of public libraries to develop new measures, especially outcomes.
Intrigued? For more information, visit this page on the website of the National Commission on Libraries and Information Science: http://www.nclis.gov/statsurv/NCES/newmeasures/index.html.
Are you measuring some new statistic–or an old one in a new way? If so, please comment.