One of the nicer features I found in the IE toolbar is the ability to clear all session cookies.
In EWA (the Honest-to-god zero-footprint-no-activeX-behind-the-scenes-we-swear Excel Web Access component) we use session cookies to remember what session the user is on so that we can always bring them back to the same session (as long as the session is still available).
That's great for the user and all, but it's kind'a annoying when you debug and you want to blow the cookies away to try out something.
Under the "Misc" option in the IE dev toolbar, there's an option to do just that. Groovy.