question on railfrog

i would like to know why railfrog is not working on any platform higher than rails 2.0.5

Most likely because it is an Engine plugin, and the API for those
changed significantly in Rails 2.1 (I seem to recall). It looks like
the project had sat dormant for all of 2008 and most of this year, so
they have a *lot* of updating to do.

--Matt Jones