Well, apparently I'm the last to notice this one (likely because I've been up to my ears in PowerShell, not Ruby) but "SapphireInSteel" is a Visual Studio 2005 Project add-on that adds Ruby *editing* support to Visual Studio.
This has nothing to do with turning Ruby into IL or making Ruby a .NET Language (although those projects exist.) This is about editing and debugging Ruby within Visual Studio 2005.
If you haven't played with Ruby, take a moment and do this:
This'll be great for everyone who does both Ruby and .NET, but especially for those doing .NET plus Watir development. This is apparently a very actively development project so subscribe to their blog.
Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. I am a failed stand-up comic, a cornrower, and a book author.
Disclaimer: The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.