Audio Podcasts:
Eric Lippert works on the C# team and often talks about language design choices. As for podcasts, I would check out .NET Rocks! not exactly c# or even always .NET specific, but still might help you out some.
Checkout Scott Hansleman's podcast, Hanselminutes. Scott talks about various .NET related tools and technologies every week and is always very interesting.
Check out this SO thread - tons of useful links
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