If you get annoyed by the drop-down suggestions list that appears as soon as you start typing in Google’s search-field you can turn them off in the Search preferences on the Google home-page, but as soon as you clear your cookies etc they’ll be right back there again. To turn them off permanently, just add /webhp?complete=0 to the end of the http://www.google.whatever in the address field of your browser, and re-bookmark it, or change your homepage accordingly if you have Google as your homepage, and you’ll never see them again.
When I originally posted this, the .whatever bit caused a little confusion. What I meant was the end part of the URL, which is country-specific. So, for instance, those using google.com would change the whole URL to http://www.google.com/webhp?complete=0 whilst Brits, whose URL ends in google.co.uk would use http://www.google.co.uk/webhp?complete=0 . Whatever the country-code, just add the extra bit after it.
(Note: Your browser might have its own inbuilt auto-complete function, which may also need to be turned off, or you might just find Google’s suggestions replaced by your browser’s. Anyone needing help with that, feel free to ask.)