We've since shipped SQL Server Compact, so these B2 links are no longer valid. There were some good comments on the blog, so keeping with blog tradition, I don't want to kill this post. To get the final, released, RTM product, please visit: www.Microsoft.com/SQL/Compact
For those that wish to download and use SQL Server Compact 3.5 B2, or Sync Services for ADO.Net with Visual Studio 2005, you can simply download this ~2mb package and get started today. For the designer support, you can download the larger, but more functional Visual Studio 2008 B2
You won't be able to use any of the Visual Studio 2005 designers for SQL Server Compact 3.5 as they specifically look for version 3.1, however the same coding scenarios will work. ...plus you get the new features such as TimeStamp and Sync Services.
SQL Server Compact 3.5 B2 for Windows Desktop operating systems
SQL Server Compact 3.5 B2 for Windows Mobile
Please continue to provide the great feedback on our forums and blogs