Looking for a live search tool for your blog ? Then check out Sikbox, a light-weight and impressive search application that can be easily embedded to a site with a simple piece of code. We added it to our celebrity site and the results are displayed fairly fast in a very nice, slick user interface. The relevancy of the results is still not perfect, but overall it´s pretty decent.
There is also support for image search and, best of all, it´s free and customizable.