AJZaurusUSB 0.5.3 is available.
It fixes the Info.plist for OpenMoko and has a new scheme to determine the Ethernet MAC address (which was randomized on the OpenMoko on each reboot). Now, you should see in the System Settings / Network only one Interface per device type.
Please note that AJZaurusUSB can basically support multiple devices connected through USB - but since neither the Zaurus nor the OpenMoko provide a clear serial number, you can connect only one of each type. If you connect two Zaurus devices or two OpenMoko devices, they will be configured to the same IP address.
If someone has an idea how to read a unique ID from the USB interface, this could be improved.
-- hns