Some more details on my setup and investigations.
The problem is 100% reproducable for me on a Dell Latitude D520.
I have narrowed it down as follows:

Boot machine then switch to text console before logging in
Login in text mode as root

/etc/init.d/gdm stop
/etc/dbus-1/event.d/26NetworkManagerDispatcher stop
shutdown most other services (ps -ef output showing processes remaining in 
attached file)

strace -p <PID OF NM> -f 2> /var/log/nmstrace.log &

do a ALT-SysRq t  to dump kernel threads before hang to syslog

kill -15 <PID OF NM>

system now hangs after a couple of seconds:
No more console echo
Cannot switch virtual consoles
Cannot connect or use existing SSH sessions
Cannot ping machine

do another ALT-SysRq t to dump kernel threads after hang to syslog
ALT-SysRq s  (sync disks)
ALT-SysRq b  (reboot)

Attached is an archive with the logfiles from all this.



** Attachment added: "Log files from network manager hang"
   http://launchpadlibrarian.net/11867220/NM-HANG-183568.tgz

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Gutsy network-manager causes OS to freeze on system restart or power down
https://bugs.launchpad.net/bugs/183568
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