Ruby In Steel, an IDE for Ruby on Rails, has been released by SaphireSteel. The IDE is based on the Visual Studio 2008 Shell and will sell at a starting price of $49 or $199 for the developer edition (you can get more information here).
Below are the minimum system requirements to run the IDE.
Minimum Requirements: Windows XP (service pack 2) or Vista. Visual Studio 2008 Standard Edition or above is optional - if you don’t own Visual Studio 2008, Ruby In Steel will install a standalone Ruby-language edition of Visual Studio 2008.

You can get a list of all the application features here.
Below are a few excerpts from the InfoWorld article: Ruby on Rails IDE geared to Visual Studio 2008 users.
"We put all our support into Visual Studio so the end-user gets a Ruby-flavored edition of Visual Studio," with its attendant capabilities, Collingbourne said.
Use of the Visual Studio Shell gives SapphireSteel a chance to compete with Eclipse-based IDEs, such as CodeGear's 3rdRail, which also is billed as a Rails IDE, SapphireSteel said.
The IDE is a great tool for those that like the Visual Studio IDE and would like to develop Ruby on Rails applications.
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I' d like to se a Feature Comparison table with netbeans
Thanks
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