My wifi also seem to stop after a couple of hours for no reason.
$ uname -a
Linux Pieters-PC 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 19:31:57 UTC 2010 
x86_64 GNU/Linux
$ lspci | grep 5100
02:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] 
Network Connection

To fix
!/bin/sh
sudo poff -a
sudo ifconfig wlan0 down
modprobe -r iwlagn
sudo killall nm-applet
sudo /etc/init.d/networking stop
sudo /etc/init.d/network-manager stop
sudo modprobe iwlagn
sudo nm-applet --sm-disable &
sudo /etc/init.d/networking start
sudo /etc/init.d/network-manager start

-- 
Intel 5100 AGN wireless connection bug
https://bugs.launchpad.net/bugs/575492
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