Linux.com | Nexenta combines OpenSolaris, GNU, and Ubuntu:
"Nexenta's Alpha 5 release is available as an installable ISO, live CD, or VMware image. I opted for the installable ISO."
This is the first time I've been in a situation where I can download a vmware image of an operating system that I want to try. This just makes trying out various operating systems really easy. I wonder if nexenta has tools like dtrace?
Here is dtrace at opensolaris.org.