The Dialogue Flybook A33i is a nice device but one problem I had until now was the missing WPA support of the internal WM168 network device. But now I finally found a solution, it is based on informations if found here. A quick overview of what I did:
You need Windows XP Service Pack 3
Deactivate your WLAN Card via button on the keyboard
Download the Modified AVWLPUSB.sys
Put the modified AVWLPUSB.sys to C:\WINDOWS\system32\drivers
Activate your WLAN Card (Button on the keyboard)
Go to Advanced tab in the driver properties and enable «Firmware Download»
Restart your PC
Now you should be able to join a WPA network.