Google Suggest, auto-completes your queries based on Google's aggregated data, now, you can add it to the standard search pages by joining the keyword suggestions experiment, one of the five experiments from the search section of Google Labs.
As you type into the search box, Google Suggest guesses what you're typing and offers suggestions in real time. This is similar to Google's "Did you mean?" feature that offers alternative spellings for your query after you search, except that it works in real time. For example, if you type "bass," Google Suggest might offer a list of refinements that include "bass fishing" or "bass guitar." Similarly, if you type in only part of a word, like "prog," Google Suggest might offer you refinements like "programming," "programming languages," "progesterone," or "progressive." You can choose one by scrolling up or down the list with the arrow keys or mouse.
Google Suggest is also available by adding &complete=1 to a Google search URL (e.g.: [Google]), in Firefox's search box and in Google Toolbar. Some Asian versions of Google show keyword suggestions by default: China, Korea, India.[googlesystem]Google Suggest, Search, Search Engine, Keywords