IECount 3.2 is a plug-in for Internet Explorer which installs a series of tools in that borwser, like a powerful antipopup, a limiter for the number of windows you can open with the browser, its own clipboard, gives a list of all detected proxies, all properties are personalizable, etc.
One of the most useful tools is a searcher that lets you do multiple simultaneous searches on the 10 most popular search engines (Google, Yahoo, etc), showing you all the information on-screen at the same time.