I have the very same problem, and I can reproduce it even with linux-
backports-modules in Jaunty

"sudo lspci -vnvn | grep Wireless" -> shows:
03:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG 
[Golan] Network Connection [8086:4222] (rev 02)

"uname -a" shows:
Linux pacovi-laptop 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 
2009 i686 GNU/Linux

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modprobe -r iwl3945 causes total system freeze
https://bugs.launchpad.net/bugs/345710
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