Search in Place is a cool WordPress plugin that improves your website search by showing up search query results in real time. The plugin uses AJAX and displays results dynamically as soon you enter the search criteria. Also it groups search results by post type (post, page, attachment) and allows you to limit the number of elements in the dynamic search results. It also offers a different navigation option on the website.
Default WordPress search includes blog posts sorted by date in search results but sometimes you want to include more elements like comments in search results. Bloggers who are running group discussion blogs like P2 really need to include comments in search results because their comments covers useful content of their website. Now you can include almost every element in default WordPress search results and you can do it very easily.