Visual Studio 2008 JavaScript DebugingOne of the other JavaScript features that I’m sure will be popular in VS 2008 is the much-improved support for JavaScript debugging.  This is enabled in both the free Visual Web Developer 2008 Express edition as well as in Visual Studio, and makes using JavaScript and building AJAX applications significantly easier.One of the annoying things with VS 2005 is that you have to first run your ASP.NET pages before you can set JavaScript breakpoints in them in the debugger.

Original Post:  ScottGu’s Blog -  VS 2008 JavaScript Debugging