AJAX Custom Search gadget for Blogger.com is now available. Search gadget accesses Google Custom Search Engine (CSE) and one can use the power of Google to create a customized search experience for your blog.
Your blog users don’t have to leave your site as the Search results appear inline.
How to add the gadget on blogger.com
1. On Page Elements tab, Edit blog’s layout
2. Click on “Add a Gadget”
3. Configure the “Search Box” gadget.
If you are not a Blogger.com user, Still you can add the Google Custom Search element, and let visitors search your site and other sites you choose.