This week I finally fulfilled one of my "easy-to-achieve" dreams of long ago which consisted in trying BeOS (discontinued since 2001) or almost.
The story goes back to 2004-2005 when I spent long hours reading and thus learning about operating systems. I read Neal Stephenson's In the beginning ... was the command line He enhances linux (of course) but makes a special praise of BeOS. I wanted to try it ever since then but unfortunately I never got the chance to do that.
On my quest for BeOS I heard about Haiku but at first I looked down on it as being a mere second hand imitation of the real thing. However now that I finally decided to try it I must admit how wrong I was. Haiku is a really good operating system. Nice and clean user interface focused on usability and simplicity but stuffed with a bunch of really useful and easy to use software. Besides it is free and open source and has a powerful terminal
You can download it in three formats: anyboot (images for usb devices), iso (for cd's) or VM (images for virtual machines). At the moment of writing this it is in alpha 2 state but I found it very stable. It woks great. I have not installed it on a hard disk but tried it with qemu and with a live cd as well.
One more to my list ... of favourites.