Planning for WCF RIA Services?

There are currently two version of WCF RIA Services:

• WCF RIA Services Beta for Visual Studio 2008 SP1
• WCF RIA Services Preview for Visual Studio 2010

The first is compatible with Silverlight 3 and the second with Silverlight 4.  From what I understand, Microsoft will not update the current Beta for Visual Studio 2008 SP1.

In other words:

• Using Silverlight 3, you’ll use RIA Services bits that will stay in Beta forever.
• If you want to use the final (and supported) RIA Services bits, you’ll have to develop for Silverlight 4, meaning upgrading to Visual Studio 2010.