From wikipedia :
"Singularity is an experimental operating system being built by Microsoft Research since 2003. It is intended as a highly-dependable OS in which the kernel, device drivers, and applications are all written in managed code."You can also try out the tutorial i.e compile the source and run it on Virtual PC , just see the links below.....
Sattvik's take on Singularity
Urjit on Singularity
Singularity from MSR
for more details on "singularity" , feel free to contact : email@example.com