The new Google Blog Bar is a Google AJAX Search API application that lets you easily add application and page-controled blog search results to your web pages or blog. It provides search-driven bars of blog search results, and is highly customizable too.
Adding the Blog Bar to your page is quick and easy by using the Blog Bar Wizard, which helps you through some simple customizations and generates all of the code for you. You can control which blog results it displays through both APIs, and if you like, through links on your page.
It reminds me of the Google AJAX News Bar which lets you put Google news on your site. Try it.