Does IE 8 Developer toolbar have something better than firebug ? How to use IE 8 Developer toolbar in a way like we use firebug in firefox.? Is there any good tutorial on "how to take good use of IE 8 Developer toolbar"?
If you're looking for something that mimics firebug in IE (your question is unclear), then there is Firebug Lite. If you're looking for a resource for learning about the IE8 Developer Toolbar there is this article and a number of other articles available via simple searches.
edit: got a more up-to-date link for the Dev Toolbar article