fxri is an interface to Ruby's RI documentation. It has several nice
features:

* Search Engine with search-on-typing
* Includes Martin DeMello's excellent fxirb.
* Syntax-highlited ri output.

fxri is available via ruby gem, just type

gem install fxri

Here is a screenshot:

http://martinus.geekisp.com/rublog.cgi/Projects/fxri/fxri.html

martinus