CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (July 18, 2008)
Total no. participating publishers & societies 2,579
% of non-profit publishers 64%
Total no. participating libraries 1,402
No. journals covered 20,888
No. DOIs registered to date 32,696,420
No. DOIs deposited in previous month 319,414
No. DOIs retrieved (matched references) in previous month 9,084,763
DOI resolutions (end-user clicks) in previous month 21,272,059