Search Engines || Information Architecture

The More from Google plugin adds the required fields to your
search form and outputs the required XHTML and Javascript to display
Google’s results within your WordPress search results page.

AdSense-Deluxe is an easy-to-use plugin for WordPress 1.5+ (including WP 2.0) for quickly inserting Google or Yahoo! ads into your blog posts, and managing when and where those ads are displayed.