>Is OpenSolaris akin to Debian Stable
>And would Solaris Express CE be akin to Debian Lenny? or Sid?

I think a better way to explain it would be to compare it to Red Hat. 

Solaris 10 is like the most stable, rock-solid, battle-tested and debugged 
version of Red Hat Enterprise Linux 4. Old versions like Solaris 8, Solaris 9 
and Solaris 10 are known for their stability and are often used in mission 
critical applications like in the finance / banking industry and in government 
/ military apps.

SXCE (Solaris Express Community Edition) is like the newer unstable branch of 
brand new Red Hat Enterprise Linux 5.3; it's got new features, but we're still 
working on getting the kinks out.

SXDE is like SXCE but I guess it's aimed for programmers and developers.

OpenSolaris 2008.05 (Indiana) and 2008.11 is like the unstable branch of 
Fedora. It's like a testing bed for insane, crazy new ideas that Ian Murdock 
and all the Sun engineers get after drinking too many jolt colas and other 
assorted energy drinks, and if some of these crazy revolutionary ideas work and 
prove to be stable after some very intense testing and debugging, they'll 
eventually find their way back into the main Solaris entperprise builds (soon 
to be Solaris 11 in a couple of years).

For an example of what one of these insane / creative ideas looks like, 
timeslider is a new feature that's slowly fighting it's way through the bugs 
and eventually making its way into 2008.11 (see link below):

http://blogs.sun.com/erwann/entry/zfs_on_the_desktop_zfs

You're not going to find a GNOME desktop feature for lightweight ZFS snapshots 
that take up almost no hard drive space and allow you to rewind all your 
folders 30 days back in time anywhere else ;-)

As a result of all the insanity and caffeine inspired creativity, I think 
Indiana 2008.05 is really frickin' cool and it's what I actually use on my 
desktop at work (I run it on bare metal, no virtual machines).

However, ONE VERY IMPORTANT WARNING:

BE CAREFUL WITH THE:

pkg image-update

COMMAND!!!!!!

The pkg image-update is a dangerous roller-coaster that will hurl your fragile 
UNIX desktop at warp speed through space and time right up to the latest and 
most unstable build of OpenSolaris Indiana (whatever that may be) and you might 
not like it (in my experience, I never liked it, which is why I still use build 
86 for my every day desktop work).

However, ZFS makes it easy to hit the undo button and use the beadm command to 
rollback to the old build (maybe build 86) instead of being stuck with the 
newest unstable build (build 101 or whatever it is now).
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