I think the pc is now confused. I recognized the Z as a new device, even though I had previously tried this with rc4. I had to point it at the usb8023k.sys driver again & the new network icon now says it's "Linux USB Ethernet/RNDIS Gadget #2". When I set the ip address, it complained that it had the same address as the "Linux USB Ethernet/RNDIS Gadget", but that isn't shown anywhere so I can delete or change it's settings. So I think this may be an address conflict problem between the two devices, but I can't see any way of removing the first one.
This is standard, I get this warning whenever I create a new connection with the same IP address.
After your ping has failed, I'd be interested to see the output of:
on the Windows machine: 'ipconfig' and 'route print'
and on the Zaurus: 'ifconfig' and 'route'
Si