Here are some quick download statistics for some of the chemblaics components. First Jmol. The new stable Jmol 10.2 was release just over a week ago, and this obviously boosted downloads, breaking the monthly download total of two earlier this year (source):
Statistics for the CDK include download numbers for the CDK library itself, but for JChemPaint, the CDK News, and several other packages too. Totals are at about 1/3rd of Jmol. Another new record, breaking an earlier record set in February 2003 (source):
Finally, I want to mention the overall download count for kfile_chemical was is much higher than I ever would have hoped for: 1125 in 7 months! Maybe I should ask to get this in the KDE extragear.
Update: fixed Jmol link.