CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (February 14, 2008)
Total no. participating publishers & societies 2,513
% of non-profit publishers 64%
Total no. participating libraries 1,349
No. journals covered 19,876
No. DOIs registered to date 30,839,034
No. DOIs deposited in previous month 539,418
No. DOIs retrieved (matched references) in previous month 7,550,426
DOI resolutions (end-user clicks) in previous month 17,371,643