Google Chrome Instant Search

With Instant enabled, most webpages begin loading as soon as you type a URL in the omnibox, before you hit Enter. In addition, if supported by your default search engine, search results appear instantly as you type queries in the omnibox, and in-line predictions help guide your search.

Because search results are requested even while you're typing your query, your default search engine may be logging these as search queries.

Within Google Chrome select the wrench, and in the Basics tab check "Enable Instant for faster searching and browsing".

FAQ's: http://www.google.com/support/chrome/bin/answer.py?answer=180655&hl=en