And there are rumours that they are now working on a new commercial OS codenamed midori, possibly based on Singularity.

http://en.wikipedia.org/wiki/Midori_(operating_system)

I played with this OS, but didn't do too much with it. I remember reading a paper about it though. The author ported ext2 to Singularity. If I can find a working link, I'll post it.

Not Opened Sourced though, which is something I would prefer and am very interested in.