I have no idea, but this map
(created by Andy Bruno
, and quoted by Tim O'Reilly
) shows what people who use SourceForge
are up to.
Update: this image
shows book sales by language. Having passed Python several months ago, Ruby has now also passed Perl. Maybe it really is
time to convert the Software Carpentry
Another update: here
's a long-term version of the books-by-language graph.