C#4 features usable while targetting .net 3.5

Question

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Is there a list of changes for C#4.0 that work in .Net 3.5?

Is there a list of features of C#4 that don't require .NET 4.0? I discovered somewhat on accident that named and and optional parameters work even when targetting .NET 3.5 and I wonder what other C# 4 features I can use.

I did a brief search and didn't find such a list, so I'm starting one here as CW

Answer 1

Check this question out: http://stackoverflow.com/questions/2561022/is-there-a-list-of-changes-for-c4-0-that-work-in-net-3-5