Accessing RDoc fast using Quicksilver
Inspired by this, but prefering [Quicksilver][] to LaunchBar, I hacked up a neat little way to browse the excellent RailsApi docs using a Quicksilver trigger. It's pretty simple to setup, and most of the credit goes to the original post and this trigger tutorial. Here's how to do it:
Download the docs
Download the appropriate RDoc zip from [RailsApi]. Here's what the interface looks like:

I chose basically everything, and I've unzip mine into ~/Sites/rdoc.