Synchronize Windows Mobile files, folders and Memory Card. Transfer any number of files. Bidirectionally. Over the network. Automatically and on schedule. Free trial. Nice interface.
U3 Sync Software: Advanced Pc Sync software that offers a complete data mobility solution to sync Outlook, Outlook Express, Windows Mail and all your personal data on a simple mobile device such as a USB key. Free Trial!
SyncBack4all allows you to sync files and folders in real time. With SyncBack4all the program will constantly monitor the files in a folder and sync them when they change. It comes with many built in sync actions: mirror, bi-directional, merge, etc.