I had a netgear which I recently lost but in the process of trtying to get it working I came up with this page (amongst others)
http://acx100.sourceforge.net/wiki/ACX
you might want to check it out if you haven't already.
also with some distros acx111 works out of the box .. Ububtu 9.04 for example .. I know since I was using mine in there before it went walkabout.