Deirdre: This page needs editing to separate the two.
Jim: Alternatively, there may (should?) appear pages on building and contributing to illumos OS/Net with other distributions based on it?
While there are many different good OSes and distributions based on common illumos kernel and contributing to its development, the OpenIndiana project remains about the most generic distribution as a most-direct ideological descendant of the OpenSolaris project, and is dubbed the reference distribution. In fact, some OpenIndiana projects are being renamed into illumos namespace these days, while the illumos project will soon use the development, organizational and building processes developed for OpenIndiana. The two projects also share some infrastructure and some of the developers.