CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (October 27, 2006)
Total no. participating publishers & societies 2,204
% of non-profit publishers 64%
Total no. participating libraries 1,114
No. journals covered 15,260
No. DOIs registered to date 23,284,690
No. DOIs deposited in previous month 282,524
No. DOIs retrieved (matched references) in previous month 4,340,033
DOI resolutions (end-user clicks) in previous month 12,272,886