Carlos Segura is making a nice application for Pocket PC, called Sharepoint List Explorer, that essentially permits you to list the content of some lists of a Sharepoint server and update it each every N minutes.
This application uses the Sharepoint webservices and it's quite simple, but shows how to work with a Sharepoint site from a Pocket PC. It needs the user credentials and the direction of the web service to use and shows all lists available and later it shows the content of the list selected in a datagrid:
You can also view the web service response via the debug screen provided. Nice work, I'm interested to see the next phases of the project. You can download the source from HERE.