Hi, I've just released the rails-web-console gem.
Have you ever wanted to test Rails scripts directly in the browser? Now you can. It'll be run in a controller's instance binding, so you can see your session, for instance.
Installation is as simple as adding this to your Gemfile (only Rails 3 is supported at the time):
gem 'rails-web-console', :require => 'console', :group => :development
Then access '/console' and you're set.
Source is availabe in:
https://github.com/rosenfeld/rails-web-console
You can contribute with syntax highlight or porting it to Rails 2, for instance, if you want to.
Best regards,
Rodrigo.