in reply to web-dev and perl (mason, catalyst, embperl)

I'm not sure exactly what you're asking, but in-line perl in the form of Mason and other tools is widely used, and used on much larger sites than Rails. If you want a simple option for MVC development, CGI::Application is quick to set up and runs well on plain CGI servers as well as mod_perl and FastCGI. You can use any of the popular templating systems with it.