A wonderful article from Outsell Insights on their report on the value of libraries (includes figures):

http://www.outsellinc.com/store/insights/3538

Where I originally saw the report mentioned:

http://www.bizreport.com/2007/08/endusers_are_increasingly_turning_to_libraries.html

Read these and send the links to your administrators! Quoting the Outsell Insights article:

"In light of Outsell's newest ROI data, it seems penny-wise and pound-foolish for enterprises to eliminate library budgets in a time of increased information challenges." Amen to that.