CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (January 19, 2007)
Total no. participating publishers & societies 2,311
% of non-profit publishers 68%
Total no. participating libraries 1,161
No. journals covered 15,713
No. DOIs registered to date 24,710,400
No. DOIs deposited in previous month 354,718
No. DOIs retrieved (matched references) in previous month 4,360,848
DOI resolutions (end-user clicks) in previous month 15,609,517