CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (December 14, 2007)
Total no. participating publishers & societies 2,479
% of non-profit publishers 64%
Total no. participating libraries 1,32
No. journals covered 19,560
No. DOIs registered to date 29,836,442
No. DOIs deposited in previous month 475,749
No. DOIs retrieved (matched references) in previous month 8,561,687
DOI resolutions (end-user clicks) in previous month 17,382,113