What I found most interesting there is that, if the 100% annual growth continues, Ruby will overtake Java in a little over a year, and become the most popular language (based on books sold) shortly after that.
Of course, it looks like ruby is slowing down, so that might not ever happen.
Also, since Groovy came from nowhere, it's growth rate is basically infinite. If that trend continues, by next month every atom in the universe will have bought a Groovy book...
Of course, it looks like ruby is slowing down, so that might not ever happen.