Looking for resources to determine the return on investment for your library?
A great example of estimate of annual added value (plus has a citation at the bottom that you might be able to use) [ http://www.dot.state.mn.us/library/mndot_library_benefits.html ]

A discussion about ROI that may give you a starting place
[ http://www.dialog.com/communities/forums/messageview.cfm?catid=3&threadid=13 ]

Article on value and ROI from March 2003 Information Outlook
[ http://www.findarticles.com/cf_dls/m0FWE/3_7/99011610/p1/article.jhtml ]

There is also a pre-recorded webcast "The Library's Contribution to Your Community" on [ http://www.illinoislibrarysystems.info/advocacy/advocacyday2004.html ] that may help you identify value points.

Don't forget to check with your local Special Library Association chapter members for additional ideas. Special libraries have long been in the ROI arena, and may have resources to help you.