Well I received my Imate PDA2K and tried to connect to my home wireless network. I have the system set to only allow named mac addresses. I looked high and low within the PDA2K for the built in wifi Mac address and could not find it. Turns out I am not the only one. One solution is to download the program vxIPConfig and load it on your PPC. Even though it is written for 2002 it ran fine on the 2003 OS. You can find the program here:
vxIPConfig
Just turn the wifi on and run the program and it will give you the MAC and additional device info. Don't have the PPC connected to the USB or it will identify that device.
By the way this is one nice machine so far - but it is my first PPC and I have a lot to learn.