In this screencast, you will learn how to get the most out of JavaScript programming with SharePoint 2010 projects in Visual Studio 2010. You will see how to get JavaScript Intellisense and debugging working for jQuery and the Client Object Model. You’ll also learn about the benefits of using the Microsoft Ajax Content Delivery Network (CDN).

If you don’t pause your video player at the right time, you might miss the location of the SharePoint JavaScript files. Here is a link to the MSDN How to article that talks about those files:

http://msdn.microsoft.com/en-us/library/ff798328.aspx

Direct link:

https://channel9.msdn.com/posts/JavaScript-Intellisense-for-SharePoint