May be i am a little late, but i have just seen this post now ...
You should take a look at RAPI (Remote API). There is a C# implementation on this site :
http://rapi.codeplex.com/[
^].
Using this API, you will able to create a program that detect any windows mobile (or windows CE) that connect on an usb port, and automatically copy data from it to the desktop computer.
As i remember, there is a simple demo with the code, and it is really simple.
Romain TAILLANDIER.