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With C# 3.0 you could use many of its features (object initializers, var variables, lambda expressions) while still targeting .NET 2.0 or 3.0.
What new C# 4.0 features can be used while still targeting the .NET 2.0, 3.0 or 3.5 runtimes?
Dynamic features: Probably not. I suppose they COULD implement the dynamic features without the DLR, but that doesn’t seem likely.
New generic constraints: The CLR supports them
Optional and named: CLR already supports it (VB-style)
Update: I just heard that C# 4 compiler will not support anything under 4.0 framework.