If you are serious about web design and using CSS, then you probably have found Chris Pederick’s Firefox extension, Web Developer indispensible for investigating web rendering issues. However, Web Developer is only for Firefox and Mozilla browsers, when it came to Internet Explorer, we were out of luck, that is until now. Microsoft now has a Web Developer Toolbar for IE6 and IE7. It is still in beta, but definitely something you need to download and start using.
Now all we have to do is get Apple to make something similar for Safari.
You can download either toolbar here: