Down-to-Earth introduction to ASP.NET AJAX 1.0

AJAX is all the hype these days, but if you are new to the concept, it can be sometimes difficult to get a down-to-Earth introduction to the implementation details. Sure, MSDN has plenty of material available about ASP.NET AJAX 1.0, but there's also a good article at the C# Corner, titled "Getting Started with AJAX 1.0". Although a bit on the short side, it shows what most of the beginners need.