1. SQL Server Compact 3.5 for Windows Desktop Beta 2: Installs the files for SQL Server Compact 3.5 and Microsoft Synchronization Services for ADO.Net for Windows Desktop platform
2. SQL Server Compact 3.5 for Windows Mobile Beta 2: The download contains the CAB files and DLL’s that are used to install SQL Server Compact 3.5 on the Windows Mobile Devices platform
3. SQL Server Compact 3.5 Server Tools Beta 2: Installs the Server Tools on the IIS server enabling merge replication and remote data access (RDA) with SQL Server 2005 and later.
4. SQL Server Compact 3.5 Books Online Beta 2: The download contains SQL Server Compact 3.5 Books Online and Read Me. SQL Server Compact 3.5 Books Online do not install with Visual Studio 2008 Beta 2. The Books Online are only available on the Web.
[Information care of Ambrish's post on the SSCE forum]