CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (February 09, 2007)
Total no. participating publishers & societies 2,328
% of non-profit publishers 66%
Total no. participating libraries 1,176
No. journals covered 15,807
No. DOIs registered to date 25,062,190
No. DOIs deposited in previous month 585,846
No. DOIs retrieved (matched references) in previous month 3,719,262
DOI resolutions (end-user clicks) in previous month 15,811,334