I am a Mac user and today I downloaded this new tool named Inquisitor. Basically, it is this little program that is out of the way. You can begin typing in the little search box and as you type it the search is refined. You can search Google, News, Images, Shopping, Dictionary and Thesaurus.
Seems like a neat tool so far. Let's see if its something I continue to use. Check out the images below. Top right image, is when I types "search engin" and the bottom right image is when I completed typing the last letter "search engine".
Forum discussion at Search Engine Watch.