MS Sync Framework

To prove that they are everywhere, they have now brought out a framework just for synchronising stuff across two domains. Based on a provider model, this could be extended to sync any data (files, tables,). Sync services for ADO.NET is one provider which you could readily use to sync data from your client machine to the DB server. The other one readily available being the file services provider.

Check out the classes in Microsoft.Synchronization.Data.SqlServerCe to start with this and also check out the ADO.NET BOL.