Does the USB subsystem register your Z as a new networking adaptor
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If it appears, try giving it (the PC end) an IP address (192.168.129.200 for example), and then try ping'ing the Z to see if it's working correctly:
ping 192.168.129.201
Yay! it works.
lardman rocks!So for the next person who gets stuck, here's what I did:
(Win2K machine...although probably similar for XP)
1) Install the 3.5.2 (or whatever) ROM
2) Install Qtopia 1.7 on your Windows machine. Keep the regular configuration (USB, ip addy for Z should be 192.168.129.201)
3) Put the CD with the drivers for the cradle and Z into your CD drive and then plug in the cradle.
4) Install the drivers for the cradle, then plug in the Z.
5) If you having problems with the Z not being recognized, there are script workarounds, but the easy way is to take the Z out of the cradle, go to the Settings tab, then click on "Shutdown" and then select "Reboot". Once you see all the text scrolling by as it reboots, put it back into the cradle and wait until it's all booted up.
6) Then go into Start -> Settings -> Network and Dial-up Connections, and you should see a new local area connection (for me it's "Local Area Connection 2").
7) Open that connection up and give it an ip address of 192.168.129.200 (that's the ip address for the PC side of things). Now click "Ok", etc... to close that dialog (which will apply your changes to the connection).

Go to the Z in the cradle and click on Settings -> Network, and select "(usbd0)".
9) Then click on the "Configure" button.
10) There are two checkboxes marked "Automatically bring up" and "DHCP" -- uncheck both of them.
11) Set the textbox "IP Address" to 192.168.129.201 (the subnet mask should automatically be set, but if not, make it 255.255.255.0).
12) At this point for me I started to get dialogs on the PC and the Zaurus asking for permission to create a connection, etc... Just follow them and allow access.
13) Things should just sync up.
Hopefully this will be helpful to someone.... ;-)
Notes:
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* If you're having problems, go to Start -> Settings -> Control Panel, then double click on System and click on the Hardware tab. Under the Device Manager area, click on Device Manager..., then go down to "Universal Serial Bus controllers", click on the "+" to the left of that entry, and look for something with a yellow triangle or an exclamation mark icon to the left of it. That's probably the Z device, so take a look at its properties to see what error you get.