Those of you using Visual Studio 2005 may be interested in the latest
release of the Steel IDE for programming Ruby. The latest update
includes a variety of tools aimed at Rails development - for example:
integrated project management, script-running dialogs (Controller,
Scaffold, Model, Gems etc.), rhtml support (colour and collapse),
database setup wizards, import existing Rails applications etc.
These are in addition to existing Ruby editing and debugging features.
You can download Steel from http://www.sapphiresteel.com