There was a plugin for IE so that you could get a developer toolbar with some extended script debugging. As of IE8 a toolbar is built in and can be reached by pressing F12.
Do you want to send a comment or give me a hint about any issues with a blog post: Open up an issue on GitHub.
Do you want to fix an error or add a comment published on the blog? You can do a fork of this post and do a pull request on github.