A bit late ;) but .NET 3.5 beta1 was released a couple of days ago...

http://www.microsoft.com/downloads/details.aspx?FamilyId=E3715E6F-E123-428B-8A0F-028AFB9E0322&displaylang=en

"The .NET Framework 3.5 adds new features in several major technology areas; including:

• Deep integration of Language Integrated Query (LINQ) and data awareness
  
• ASP.NET AJAX for quickly creating more efficient, more interactive and highly-personalized Web experiences that work across all the most popular browsers
  
• New web protocol support for building WCF services including AJAX, JSON, REST, POX, RSS, ATOM and several new WS-* standards
  
• Full tooling support for WF, WCF and WPF including the new workflow-enabled services technology
  
• New classes in the base class library (BCL) for the .NET Framework 3.5 address the most common customer requests. "

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