http://blogs.msdn.com/drnick/archive/2008/01/09/what-s-new-in-orcas.aspxThe official list is a little hard to find but here's the overview of the big new WCF features in Orcas. WCF and WF Integration-Workflow Services: The .NET Framework 3.5 unifies the Windows Workflow Foundation (WF) and Windows Communication FoundationenCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/drnick/archive/2008/01/09/what-s-new-in-orcas.aspx#7043251Wed, 09 Jan 2008 20:35:29 GMT91d46819-8472-40ad-a661-2c78acb4018c:7043251Sam Gentile<p>I haven&amp;#39;t found much in the last 5 days that is New and Notable but here is a few items of interest</p> http://blogs.msdn.com/drnick/archive/2008/01/09/what-s-new-in-orcas.aspx#8460800Mon, 05 May 2008 19:18:12 GMT91d46819-8472-40ad-a661-2c78acb4018c:8460800Nicholas Allen's Indigo Blog<p>Today wraps up the series on detailed messaging changes in Orcas. You can get the whole series here as</p>