The Rollyo searchroll doesn’t do a good job with its embedded advertising and it’s difficult to tell the ads from the results.
I switched to my good friend Google and so far, it looks pretty good. Ads? Yes. But we are all accustomed to the Google ad concept so that makes their search tool more usable. (Non-profits, schools, and government can turn off the ads.)
Besides creating a search engine for a blog or site, you can access your personal search engine(s) via Google.
Much more control over the look-and-feel and you can specify keywords for tuning your search results. There are also a few advanced features: context, annotations, and refinements. (Sorry, I’m not taking the time to even dig into them right now. You’ll have to go look yourself.)
I have invites to the Google Co-op world where these personalized search engines exist. Drop me a line if you need one.