CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (November 30, 2007)
Total no. participating publishers & societies 2,473
% of non-profit publishers 64%
Total no. participating libraries 1,289
No. journals covered 19,398
No. DOIs registered to date 29,609,426
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