.NET Framework - features in 4.0 that's better than 3.0 [duplicate]

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What features are people looking forward to in .Net 4.0 - 4.1

Hi folks, i would like to know what is it that motivated you to move to .net 4.0 from earlier frameworks?

What specifically could be done better & what was the scenario?

TIA

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The task parallel library and the concurrent collections.

They both made many multi-threading situations much simpler.

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You can also take a look at this similar question. Although it's a mix of Visual Studio 2010 and .NET 4 features.

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Default parameters (more of a C# 4 feature than a CLR 4 feature though).