When we talk about os the first thing come to mind is windows unless and untill you are open source geek. For such geek the fist answer is Linux (Red Hat, Ubuntu, Fedora , Centos etc...).
When some one say about Solaris we feel not for the normal user. But thats not the fact now. Opensolaris 2009.06 is very user friendly with some nice features beating other very hard.
It has a simple graphical interface like gnome as its to built on Unix. It is also available on Live CD which means you can simply use it without installing (like ubuntu).
The main fetaures or points that make it ousstanding are :
1. Aguided Code base
4. Stability and backward comaptibility
5. Software Support
It comes with firefox , thunder bird , Net beans and many other.
To download click here.
To view screenshots jst google in images with opensolaris.
For more details log in to opensolaris.org