CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (November 10, 2006)
Total no. participating publishers & societies 2,206
% of non-profit publishers 64%
Total no. participating libraries 1,115
No. journals covered 15,329
No. DOIs registered to date 23,591,680
No. DOIs deposited in previous month 790,985
No. DOIs retrieved (matched references) in previous month 3,995,186
DOI resolutions (end-user clicks) in previous month 15,593,696