OpenSolaris

Genunix
OpenSolaris news, links, downloads: distribution (BeleniX liveCD), Nexenta OS (GNU/Solaris), SchilliX.
http://www.genunix.org/

Nexenta
An operating System combining the OpenSolaris kernel with GNU application userland. Site includes downloads, documentation, community support, how to get involved, list of sponsors, and a package repository.
http://www.nexenta.org/

Nexenta Systems, Inc.
Custom OpenSolaris technology; over a decade experience building Solaris and Linux systems, pioneered GNU/OpenSolaris: integration of OpenSolaris (SunOS kernel) and Open Source Software (OSS) programs. California, USA.
http://www.nexenta.com/

OpenSolaris
Growing article, with links to many related topics. Wikipedia.
http://en.wikipedia.org/wiki/OpenSolaris