The Google Toolbar is available free of charge and includes these great features: Google Search: Access Google's search technology from any web page.
Search Site: Search only the pages of the site you're visiting.
PageRank: See Google's ranking of the current page.
Page Info: Access more information about a page including similar pages, pages that link back to that page, as well as a cached snapshot.
Highlight: Highlight your search terms as they appear on the page; each word in its own color.
Word Find: Find your search terms wherever they appear on the page. Learn more @ Google.