ViewStateAnalyzer is a tool for ASP.NET 2.0 developers. It's an Internet Explorer toolband that allows you to analyze local ASP.NET pages.By pressing the "Analyze" button, you will retrieve page controls graph and for each element you can check the handled event, read the viewstate saved by the control and HTML rendered, easily focusing it into IE.

http://lab.aspitalia.com/26/ViewStateAnalyzer200.aspx#eng