Reddit-style nested/threaded/indented comments for Rails?

Question

I\'m wondering if someone has already built a system for threaded comments (for lack of a better term) in Rails or if I need to build it myself.

In case it\'s not c

Answer 1

The links to the ActsAsTree documentation as given by Hector and Samuel seem to be broken. You can get the docs at

 
http://web.archive.org/web/20061011101510/http://wiki.rubyonrails.org/rails/pages/ActsAsTree

(I used a pre tag as the linked kept displaying wrong for some reason).