CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (November 05, 2008)
Total no. participating publishers & societies 2,664
% of non-profit publishers 64%
Total no. participating libraries 1,432
No. journals covered 21,364
No. DOIs registered to date 33,863,093
No. DOIs deposited in previous month 323,850
No. DOIs retrieved (matched references) in previous month 11,899,312
DOI resolutions (end-user clicks) in previous month 23,022,919