Comment 120 for bug 121439

Here's what I did to use the iwl3945 driver:
sudo modprobe -r ipw3945
sudo modprobe -i mac80211
sudo modprobe -i iwl3945
sudo /etc/init.d/networking restart

Note: iwl3945 will use wlan0 as the interface instead of eth1 (at least on my hardware). Also, it seems that loading iwl3945 automatically unloads ieee80211.

I was able to connect to an unsecured wireless network and access the internet. I do not have a secured network to try it with, so I don't know if that works.