I.E. Development Toolbar
I came across a new free Microsoft tool for assisting me in developing websites. Internet Explorer Developer Toolbar beta 3 can allow developers to easily understand and troubleshoot complex web pages.
The core function of this tool exploits the document object model (DOM) in a simply done user interface. It can be pinned to you're browser while exploring a web page. You can read about more of the other features on the Microsoft Download Center where this tool is available.