CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (July 27, 2007)
Total no. participating publishers & societies 2,406
% of non-profit publishers 64%
Total no. participating libraries 1,254
No. journals covered 18,720
No. DOIs registered to date 28,132,422
No. DOIs deposited in previous month 469,495
No. DOIs retrieved (matched references) in previous month 4,078,939
DOI resolutions (end-user clicks) in previous month 13,628,017