The ReactOS project, which I follow pretty closely, has finally released version 3.13 as of today. It is claimed to support running Mono now, so I’m really curious to see how well it does. Eventually having an open source Windows replacement, which can also run .Net code, could be a really good thing. I will be running it inside a QEMU emulator (full qemu + reactos image can be downloaded as one) and see how it works.
More info available via www.reactos.org