CrossRef Indicators
The latest stats on CrossRef activity have been posted at
http://www.crossref.org/01company/crossref_indicators.html
CROSSREF INDICATORS (September 07, 2007)
Total no. participating publishers & societies 2,434
% of non-profit publishers 64%
Total no. participating libraries 1,258
No. journals covered 19,026
No. DOIs registered to date 28,598,057
No. DOIs deposited in previous month 344,084
No. DOIs retrieved (matched references) in previous month 5,785,432
DOI resolutions (end-user clicks) in previous month 12,845,178