Using this site search module your site users don't have to leave the home page to see the results of their search. A pop-up window displays the results intelligently searching as you type and adjusting the results of the search as new words are added. The window is styleable via parameters or css module. There is a free version and a more complete pay version. I am using the free version
An oddity (or bug?) is when you opt to use the search button. Clicking the button takes you directly to the normal, default Joomla style listing. What's the point of that? Otherwise I love these new touchy-feely Ajax programs that operate almost like Flash.