As, posted earlier, Goole launches search-before-you-type, "Google Instant," a new Google.com interface that creates an interactive search experience for users by predicting their query as they type and instantly showing updated results. This new interface applies to both search results and related ads.
"As a result, with Google Instant, an impression is counted if a user takes an action to choose a query (for e.g., presses Enter key or clicks Search button), clicks a link on results page, or stops typing for three or more seconds. It's possible that this feature may increase or decrease your overall impression levels. However, Google Instant may ultimately improve quality of clicks since it helps users type queries that more directly connect them with answers they need," explains Google. [More: Help Center]
Google Instant rolls-out to US, UK, France, Germany, Italy, Spain and Russia and support "Chrome v5/6, Firefox v3, Safari v5 for Mac and IE8" browsers. Users on non-Google.com domain can access Instant when signed into Google Account. If you still don't see it, try this URL: http://www.google.com/webhp?sclient=psy.
Here're some shortcuts:
Tab/Right arrow = pick the first suggestion
Up/Down arrow = select another suggestion from the list
Right arrow while selecting a suggestion = I'm feeling lucky
Enter or Esc = ignore the suggestions and find the results for your query