You definitely do not need to use ndiswrapper....

You definitely do not need to use ndiswrapper.

All you need to is :
Download the latest firmware from the link Reed already posted :
http://ipw2200.sourceforge.net/firmware.php
Extract the files from the downloaded .tgz archive.
Copy the extracted files as root user to /lib/firmware
Now either reboot or insmod ipw2200
(Whichever works.)

You should then have an adapter that you can scan and connect using.
Here is a guide that is helpful to connect wirelessly to a wpa encrypted network (The most common type) :
http://wiki.archlinux.org/index.php/WPA_Supplicant#Procedure

Click Here!