The above walkthrough hopefully provided a good overview of some of the new JavaScript debugging features coming soon.  There are many more JavaScript and AJAX features coming in VS 2008 and .NET 3.5 that I'll be covering in future blog posts. 

Note that because of the new VS 2008 multi-targeting support, you can use the JavaScript debugging features above with both ASP.NET applications built using .NET 3.5 (which also now has ASP.NET AJAX built-in), as well as with existing ASP.NET 2.0 applications (including ones that use the separate ASP.NET AJAX 1.0 download). This, combined with the new VS 2008 JavaScript intellisense support, provides a very compelling reason to start using VS 2008 - even if you are using it to only target .NET 2.0 applications.

Hope this helps,

Scott

P.S. To learn more about VS 2005 JavaScript Debugging, please read this blog post.  Dan Wahlin also recently posted a nice set of AJAX testing and debugging tools that I recommend checking out here.