Sun just lunched new OS name OpenSolaris. OpenSolaris is an open source project. It's also a community and a website for collaboration, conversation, source, downloads, mailing lists, events and developer tools
How is difference?
Solaris 10 is the latest version of Sun's tested, certified and supported enterprise operating system, available free for download. Future versions of the Solaris operating system will be based on technology from OpenSolaris. Sun will continue to invest in delivering a high quality, highly secure and reliable commercial Solaris Operating System, with the same amount of extensive quality testing and security protection as always expected.
In my opinion, I think OpenSolaris and Fedora is as a front line OS. That’s mean SUN use OpenSolaris to implement new technologies, new version of software or introduce new features. If anything is enough stable then SUN will implement to production Solaris OS. Are you ready? Try? Why not download? just visit http://opensolaris.org/os/downloads/ page.
OpenSolaris (Offical website)
Download Solaris 10