Wednesday Dec 10, 2008
With the IPS issues fiex in the latest OpenSolaris 2008.11 release, it is from now on very easy to upgrade to a latest build or image.
(Note: see my other blog entry on how to upgrade from OpenSolaris 2008.05)
If you prefer using the GUI, the Package Manager, watch this:
If you prefer using the command line, as so many of us do, watch this:

Wednesday Dec 10, 2008
UPDATE, Dec 15 2008: As some of the fixes have been integrated back into OpenSolaris 2008.05, this is even simpler now.
Please see below at Evan's comment.
UPDATE, Dec 18 2008: The screencast now also reflects the simpler method.
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To my surprise, I've come across a few blogs and comments about the new OpenSolaris 2008.11, that mentioned that it is not possible to upgrade from OpenSolaris 2008.05 to this latest version.
That's incorrect.
Although it's not as straightforward as it should be, and as it is, in fact, now (with OpenSolaris 2008.11), but it is still possible on command line, with a few simple steps.
Checkout the screencast on how to do this:

In addition, the detailed step-by-step instructions are also posted on opensolaris.org.
Happy Upgrading !
its a good one.