A bit late but here it is: there is a live/install CD available for download (on *.iso format) on the OpenSolaris official site.

Download OpenSolaris 2008.05

This version offers: Firefox 3, Thunderbird, GNOME primary desktop, support for various languages, ZFS and I suppose some more interesting things...

On DistroWatch we can read:

OpenSolaris (formerly Project Indiana)
I don't know what kind of release is this but it seems like an almost fully functional OS.

It seems that there are some distros already ready for download too

OpenSolaris based distros

Read more:

- Wikipedia
- DistroWatch
- About project Indiana