ADO.NET Data Services is no longer a prototype project and has moved into a first-class component of the .NET Framework starting with the .NET Framework 3.5 SP1 release.
Please see the following links for resources pertaining to the released production version of data services.

• Data Platform Developer Center - Data Services page
• Data services conceptual documentation on MSDN
• Data services API reference documentation on MSDN
• Data services team blog
• Data services online forum (a place to ask us your data services related questions)
• Whitepaper: Using ADO.NET Data Services V1