I just saw that steve does a couple of very cool screen casts showing off how easy it will be for WinForms and WPF client apps to operate effectively offline and in high latency networks...

Going N Tier w/WCF, Synchronizing data using Sync Services for ADO.NET and SQL Server Compact Edition

In part 1, I used the Visual Studio Orcas Sync Designer to configure and synchronize 3 lookup tables to be cached locally in SQL Server Compact Edition using the Sync Services for ADO.NET CTP.
In part 2 of this screen cast, I take the cached lookup tables and split up the client and server sync components using WCF to glue them together.