Despite all the talk of kool-aid, Ruby on Rails is a serious contender for Next Big Thing in web development. Unfortunately, while the framework is improving by leaps and bounds, the tools available for working with it haven't quite been keeping up; but that many be changing. RadRails is a new IDE built specifically for developing Ruby on Rails web apps. It's based on the venerable Eclipse cross-platform open source IDE and, though it's only up to version 0.2, includes Rails-specific goodies like WEBrick server setup, wizards for generating models and controllers, and a "Rails navigator," presumably for navigating the filesystem of a Rails project.