Ruby on Steel Text Edition allows Ruby developers to code using all the power of the VS IDE.
The All In One Solution
Includes a free copy of Visual Studio 2008 (Ruby language only), and a simple setup program to install Ruby, Rails, Visual Studio, MySQL and Ruby In Steel.
Optimized for Coding
The Power of Visual Studio
Check out the site with more screenshots here.
Infoworld is running an article about it here.