The One-Click Ruby Installer for Windows had its one millionth download sometime last night (you can see the download total on the RubyForge front page)! After working hard for the past five years to promote the use of Ruby, this is a really satisfying milestone!
Take a look at this monthly download graph that starts around August 2004 and runs through the end of last month (ignore that temporary spike around May, I believe that is a bug in the RubyForge stats somehow related to the download mirrors):
You can see the rise in downloads from 3,200 a month in August 2004 to 60,000 a month in October 2006 (earlier stats from RubyForge are now longer available, but I think downloads in 2003 were a few hundred a month). Of course the dramatic rise in downloads coincides with Ruby on Rails phenomenon.