Plugins - RailsTidy
Add to favoritesRailsTidy allows you to
- validate your rhtml templates,
- validate the html output of your functional tests,
- clean the html generated by rails.
For doing all this, it uses
- Tidy, the popular HTML validator and
- RubyTidy, Ruby bindings for Tidy.

Yeah it still gives a forbidden. the rdoc files included in the download should be sufficient though...
Eh? http://www.cosinux.org/~dam/projects/rails-tidy/rails_tidy gives a 403 Forbidden :/