CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (July 13, 2006)
Total no. participating publishers & societies 1,657
% of non-profit publishers 65%
Total no. participating libraries 1,066
No. journals covered 14,855
No. DOIs registered to date 21,744,529
No. DOIs deposited in previous month 552,599
No. DOIs retrieved (matched references) in previous month 3,159,400
DOI resolutions (end-user clicks) in previous month 12,348,559