Hmmm...
Note that all ACPI-compliant machines should implement a power-button over-ride, if you press and hold the power button longer than 4 seconds, the machine will power-off immediately. If you have a machine stuck during power-off, then you can try this over-ride.
I've always found the poweroff button behaviour rather annoying. Almost all of the operating systems that I have used have had a way for the user to select some type of GUI button to shut the machine down (FreeBSD, Linux of varius varieties and even Windows 9X-XP).
In addition -- maybe because I'm accustomed to *cough* crappy X86 hardware (and possibly inferior operating systems) -- I've never expected the power button to do anything sensible apart from turn the power off by disrupting the flow of electrons. I actually expect power buttons to turn the power OFF and that's it; oh for the good old days!
Hence, when I first saw my OpenSolaris system, I had no idea how to shut it down properly and then when I finally got the incantation correct, I discovered that an OpenSolaris shutdown seems to involve: 1) shut down services [which takes an age] 2) shut down zones 3) then do poweroff.
If I'm in a hurry, I'll just user "poweroff". I probably shouldn't but I haven't discovered the reason "why not" yet.
Realistically, it would be NICE if there was an obvious way to shut the system down from one of the default desktop menus. At least for me it would have been nice. I'm a case where I'm the only human user of the system and the reason I don't use "root" (or an RBAC equivalent of that) is to protect myself from me.
However, it would be *nice* to be able to shutdown the comp without having to reach under the table, to the back of the desk for the powerbutton.
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