Singularity !!!
O.k, one of those things we sometimes don't always hear about. Microsoft has released a concept OS for researchers and academics to experiment with how Operating Systems work and interact with Applications. Hopefully will lead to some new Architectures and interesting ideas.
Story -> http://www.infoworld.com/article/08/03/04/New-Microsoft-OS-aimed-at-researchers_1.html
MS Research Singularity Page -> http://www.codeplex.com/singularity
Codeplex Page, download link here -> http://www.codeplex.com/singularity
