CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (June 29, 2007)
Total no. participating publishers & societies 2,383
% of non-profit publishers 64%
Total no. participating libraries 1,236
No. journals covered 18,121
No. DOIs registered to date 27,319,876
No. DOIs deposited in previous month 458,448
No. DOIs retrieved (matched references) in previous month 5,529,543
DOI resolutions (end-user clicks) in previous month 16,853,427