Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Why would anyone try to introduce an operating system into the existing glut unless it pays off in spades? What can a new entrant give us that the multitude of Linux distributions, the Mac OSX and old, hoary Windows hasn't?
Sun Microsystems apparently thinks it has a lot to offer - else the so-called Project Indiana would not have been set up to churn out "a binary distribution of an operating system built out of the OpenSolaris source code."
The OpenSolaris community was set up three years ago with the stated intention of being an open development group that would not be under Sun's control. But the road to hell is paved with good intentions and it is now abundantly clear that Sun is just using the moniker of "open source" for marketing reasons. One still has to go through a requester/sponsor arrangement to submit a patch to the OpenSolaris project.
(By contrast, the Ubuntu Linux distribution started by Canonical is now a little more than three-and-a-half years old - and there is no need to detail what it has achieved).