Yahoo! Search Builder lets you build a search engine for your own web site, and or blogs for customized search experience for your web site / blog. It allow your users to search the Web, your Site / blog, and or the News. You can also personalize / customize the search results to fit your audience's needs, analyze user data, and manage multiple experiences.
You can customize your search box to match your site, by selecting the size, colors, text encodings, banner text, and “add you logo” to the search box.
What more, you can also update your search engine, view usage reports, or build additional search engines by visiting your Management page.