Ruby on Rails 2.3 Searchable API Doc18 Mar 2009
A developer by the name of Vladimir Kolesnikov has put together a nice little searchable API doc for rails. Its been updated for rails 2.3.2 (Latest Version) and you can either download it or browse online. Currently its been tested with Safari 4, Firefox 3, Opera 9.5 Internet Explorer is currently unsupported but who uses IE anyways.
You can download it here