Your home for Visual Studio 2010 and .NET Framework 4.0
Where should you start? I recommend the Visual Studio 2010 developer center at MSDN. http://msdn.microsoft.com/en-us/vstudio/dd582936.aspx
From that page you can get to forums, additional product information, FAQs, samples, resources, etc.
I particularly like the feature overviews and walkthroughs that can be found from that page. Direct link is http://msdn.microsoft.com/en-us/vstudio/dd441784.aspx
Lots of good stuff coming down the road!