CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (July 13, 2007)
Total no. participating publishers & societies 2,388
% of non-profit publishers 64%
Total no. participating libraries 1,243
No. journals covered 18,299
No. DOIs registered to date 27,833,367
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