Eurekster, known for its personalized social search efforts, has introduced a new service aimed at personal and small business web site owners that allows them to create a customized site search tailored to the content of the site. Creating a "swicki" for your site is both easy and free.
After signing up, you create your initial swicki by training it by responding to a set of questions that establish filters for the kind of content to include or not include in search results. The swicki then dynamically shares the most popular and active searches in that community.
Got a site? Try building your own swicki and see how it works.
Postscript: Here's one that lets you search against the SEW Blog that you can try: