I have same problem... but on a desktop. So the WiFi may not be the culprit. 
I've attached a pic of the final screen, similar to the one Märt has (except 
the ethernet lines, but I do not think this matters?).
On the Ubuntu forum, there's quite a lot of people with the same problem, with 
very different machines. One was able to apparently stop this to occur by:
- System>Administration>Login Window
Click "Edit Commands" and remove the last "Shut down via gdm." in both the Halt 
Command and the Reboot Command.
For him that apparently does the trick.
I tried and got finally the normal shut-down screen with the progrees bar, and 
a normal shut-down time. But only once.
I discover however that, every time I change and save the Halt or Reboot 
command in the Login Window dialog, I got my clean shut-down process.
I mean that if I delete the "Shut down via gdm.", save, then put it back again 
and save, so I have not changed anything in the end but to "refresh" these 
commands (dates? sorry I am really poor at this stuff), I got the clean 
shut-down.
When doing this with the grub option "quiet splash" taken out, I got a clean 
screen as well (i.e just "System is restarting please wait" for a reboot), with 
nothing at all about network manager or else, meaning that the shut-down is 
really clean and proper.
It is not a fix though, as I cannot keep changing these commands at each 
session, but that may give a clue as to where to look for a proper fix?

** Attachment added: "img_9042.jpg"
   http://launchpadlibrarian.net/14067853/img_9042.jpg

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network-manager fails to stop properly when connected to wireless
https://bugs.launchpad.net/bugs/155216
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