OpenSolaris is the basis for now launched Oracle Solaris 11. OpenSolaris was both a source code repository as well as a binary distribution. OpenIndiana is one of the binary distributions based upon OpenSolaris Project IndianaIllumos is one of the source code trees based upon OpenSolaris released source code. Licensing terms on OpenSolaris are closer to OpenIndiana and Illumos, but different from Solaris 11 licensing.
Community Support
[http] OpenSolaris Project Home Page
[http] OpenSolaris Community Support Forums

OpenSolaris 2008.11
[California|Romania] OpenSolaris 2008.11 x86 distribution ISO
[http] OpenSoalris 2008.11 Release Notes
[http] Getting Started with OpenSolaris 2008.11

OpenSolaris 2009.06
[http] Getting Started with OpenSolaris 2009.06
[iso|usb] OpenSolaris 2009.06 x86 distribution
[dvd] OpenSolaris 2009.06 x86 full repository (7GB)
[x86|sparc] OpenSolaris 2009.06 automated installer iso

OpenSolaris 2010.02
[http] OpenSolaris 2010.02 x86 distribution ISO (build 134)