Hey all,
I can hardly believe it myself, but mentioned WLAN NIC is now up and running :-)
Head over to Craig's page with a very comprehensive HOWTO on:
http://www.houseofcraig.net/acx100_howto.php
For those interested, the official chipset for the WL-121 V1 is ACX111/TNET1113 and the WL-121 V2 uses the Prism GT chipset.
Happy wireless networking!