At work the other day, one of my coworkers pointed out a new os that had just came down the pipeline, Nexenta. It is a Open Solaris system with an Ubuntu user land.
What does this mean? Basically you get the best of both worlds, ZFS and Solaris Zones (basically a kick ass version of bsd jails) and all the great user programs that come with Ubuntu. So in other words it is unix with the GNU tools on top.
I tried to install it on a junker computer from the Iowa State University Surplus Sale, however, it apparently requires over 256 mb of ram 
so it failed on the install. I guess I will just have to use a virtual machine to play with it… but this just means that I wont be able to put it into production, oh well!