CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (August 11, 2006)
Total no. participating publishers & societies 1,663
% of non-profit publishers 65%
Total no. participating libraries 1,082
No. journals covered 15,046
No. DOIs registered to date 22,151,528
No. DOIs deposited in previous month 495,519
No. DOIs retrieved (matched references) in previous month 4,050,392
DOI resolutions (end-user clicks) in previous month 11,709,041