We've improved Slashdot's video section; now you can view our video interviews, product close-ups and site visits with all the usual Slashdot options to comment, share, etc. No more walled garden! It's a work in progress -- we hope you'll check it out (Learn more about the recent updates).
For the.NET languages, such as XAML, C#, and VB.NET, I'd have to say that for general data on how to use the function, MSDN is a great resource, between their forums and MSDN online library.
Google's also a great resource.