Fantastic Search Add-on for FIREFOX called Inquisitor. Well worth installing this.
Inquisitor for Firefox (Beta)... speeds up your searches like no other. Start typing and websites appear instantly, along with suggestions to help refine your search. Inquisitor understands you, learning and tailoring your results as you search more. You can also add more search engines with customized keyboard shortcuts. Inquisitor is fast, smart, flexible and works with Yahoo! or Google.