Rollyo: Roll Your Own Search Engine is another service that lets you create custom search engines that only search a “Searchroll” set of domains/sites. You can have multiple Searchrolls and you can create small Rollyo search panels for your site.
They are onto something, especially if they allowed hierarchies of shared (public) Searchrolls. The down side of the service is the limit on sites you can include (25) and the advertising that shows up in the results.
Here is one I created form my personal website www.geoffreyrockwell.com: