CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (January 26, 2007)
Total no. participating publishers & societies 2,315
% of non-profit publishers 66%
Total no. participating libraries 1,170
No. journals covered 15,763
No. DOIs registered to date 24,839,481
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