Dave Pell has created a very interesting thing called Rollyo: a way to create custom search engines. This is from the Rollyo website:
Are you tired of wading though thousands of irrelevant search results to get to the information you want? Ever wish you could narrow your search to sites you already know and trust? With Rollyo, you can easily create your own custom search engines, and explore and save those created by others.
Rollyo puts the power of Yahoo! Search in your hands, by giving you the tools to create your own personal search engines – with no programming required. All you have to do is pick the sites you want to search, and we’ll create a custom search engine for you.
Check it out here. [Click on “Learn more about Rollyo” for more information.]