CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (November 03, 2006)
Total no. participating publishers & societies 2,205
% of non-profit publishers 64%
Total no. participating libraries 1,115
No. journals covered 15,303
No. DOIs registered to date 23,478,552
No. DOIs deposited in previous month 790,970
No. DOIs retrieved (matched references) in previous month 3,995,186
DOI resolutions (end-user clicks) in previous month n/a