CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (October 26, 2007)
Total no. participating publishers & societies 2,449
% of non-profit publishers 64%
Total no. participating libraries 1,286
No. journals covered 19,213
No. DOIs registered to date 29,111,222
No. DOIs deposited in previous month 316,438
No. DOIs retrieved (matched references) in previous month 6,520,756
DOI resolutions (end-user clicks) in previous month 15,699,586