EffiProz is an interesting database and it seems like they have made some very good strategic moves. For instance, Silverlight doesn’t support System.Data so EffiProz went and created their own class library that mimic's an ADO.NET provider since ADO.NET Providers aren’t supported under Silverlight....

While playing with Visual Studio 2008, I accidentally found new item type called "Local Database Cache". I turned out that this is really Microsoft Sync Framework integration with Visual Studio.