Linked by Amjith Ramanujam on Fri 26th Sep 2008 22:53 UTC
"This post is about the desktop operating systems that fly under the radar of most people. We are definitely not talking about Windows, Mac OS X or Linux, or even BSD or Solaris. There are much less mainstream options out there for the OS-curious." Though the article doesn't go into much detail about the OSes, it is a good round up of some of the interesting candidates.