CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (June 30, 2006)
Total no. participating publishers & societies 1,652
% of non-profit publishers 65%
Total no. participating libraries 1,064
No. journals covered 14,768
No. DOIs registered to date 21,517,155
No. DOIs deposited in previous month 810,257
No. DOIs retrieved (matched references) in previous month 3,615,472
DOI resolutions (end-user clicks) in previous month 10,800,000