Normally when debugging problems with web applications, I try to use Firefox. However, every once in awhile there is a web application that is very Internet Explorer specific and will not work in Firefox at all.
To that end, here is a list of nice tools and add-ins for Internet Explorer.
Frequently it is convenient, when testing and debugging (or even just when browsing normally), to purge all of the cookies for a particular site. Although it is possible to do so through FireFox’s cookie manager (accessible through Preferences, Privacy, “Show Cookies”), it is much easier and quicker to use the aptly named [Remove Cookies for…