I was reading an interesting old (circa 1999) article the other day. Some of you might find it interesting ( http://www.cryptonomicon.com/beginning.h... ). Anyway I went looking for BeOS which was in 2000 (and according to this article) the next great operating system. BeOS is pretty much dead, however, I ran across http://www.haiku-os.org/ which released an open source BeOS compatible in September 2009. You can download ISOs and VMWare images of it there.