[9fans] What makes Plan 9 unique?

[Matt Senecal <msenecal@inri.com>]

I've been looking into Plan 9 for a while and may be asked to give a
presentation on it for some people at work. This newsgroup has been a big
help in getting my Plan 9 system (built 100% from donated & scrounged junk
parts) up and running, so I thought I'd ask this question here:

What makes Plan 9 truly unique? What about it makes it better than Solaris,
or other UNIX systems?

Imagine you're going to be giving the presentation to a bunch of long-time
computer users whose main attitude going into the meeting is going to be:
"Nice lines, but so what? Why should I consider Plan 9?"

I understand that I'm going to be learning a lot of this on my own in the
coming weeks, but I wanted to make sure that there wasn't some cool feature
that I missed. There's only so much you can learn on a standalone system
(although I may be networking with an old donated '486 if I can find some
NICs).