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The C# Programming Language Version 4.0

Essentially the C# 4.0 language innovations include:

  • Dynamically Typed Objects.
  • Optional and Named Parameters.
  • Improved COM Interoperability.
  • Safe Co- and Contra-variance.

http://software.intel.com/en-us/blogs/2009/03/30/the-c-programming-language-version-40/

... and more syntactic sugar.. :-)