CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (August 18, 2006)
Total no. participating publishers & societies 1,665
% of non-profit publishers 65%
Total no. participating libraries 1,083
No. journals covered 15,079
No. DOIs registered to date 22,204,731
No. DOIs deposited in previous month 495,519
No. DOIs retrieved (matched references) in previous month 4,050,392
DOI resolutions (end-user clicks) in previous month 11,709,041