"Inline Search v 1.5.0 is an extremely useful free add-on for Internet Explorer that mimics Firefox’s search behavior. It turns searching in a web page into a non modal research experience coupled with a find as you type facility. It integrates flawlessly into IE (version 5.5 or above), giving it that little extra that makes you a lot more efficient when you are looking for a specific piece of information."

http://www.ieforge.com/InlineSearch/HomePage