The driver should already be available as it is included in the linux kernel. What you're most likely missing is the firmware, which you may have to go get and install manually depending on your distribution.
If you can't find a package named ipw2200-firmware or ipw2200-fw or something similar, go to
http://ipw2200.sourceforge.net/firmware.php and download the firmware. Depending on your kernel you may need version 2.4 or 3.0.
Then unpack the archive, and copy the firmware files to /lib/firmware/ ... copy only the actual files themselves, everything except the README, not the directory, so the files from the archive go directly into /lib/firmare.
Then you can
Code:
modprobe -r ipw2200 && modprobe ipw2200
to reload the module, and the device should show up using
as another eth* device.