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What NEW features has WCF in .NET Framework 4 vs .NET Framework 3.5? What Is new, what was fixed (in general - I do not want to get into bug fixed numbers=)?

+1  A: 

Nicholas Allen has an "alternative" list of what's new features:

* Simplified configuration
* Standard endpoints
* IIS hosting without an SVC file
* Discovery
* Routing service (previously included with Dublin)
* REST caching and help page
* Workflow services
* Non-destructive queue receive
* Simple byte stream encoding
* ETW tracing 

See: http://blogs.msdn.com/drnick/archive/2009/08/14/what-s-new-in-wcf-4-alternative-list.aspx

Those sum up quite nicely what's been improved.

Also Santosh Benjamin has a blog post with links to a series of blog posts by Christian Weyer which extensively covers the new things in WCF 4.

marc_s
what do you mean by "Simple byte stream encoding"?
Blender
I don't mean anything - this is Nicholas Allen's list of features :-) Check out Aaron Skonnard's article on MSDN (Andrew provided a link) - towards the end, there's a section on "ByteStreamMessageEncodingBindingElement" - that's probably what Nicholas Allen referred to
marc_s