CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (November 16, 2007)
Total no. participating publishers & societies 2,453
% of non-profit publishers 64%
Total no. participating libraries 1,289
No. journals covered 19,274
No. DOIs registered to date 29,304,623
No. DOIs deposited in previous month 288,050
No. DOIs retrieved (matched references) in previous month 7,132,235
DOI resolutions (end-user clicks) in previous month 17,686,733