A search engine's first job is to cull the crap. To distinguish the good from the bad. Thus a personalized search engine could double as a forum moderator. An

A search engine's first job is to cull the crap. To distinguish the good from the bad. Thus a personalized search engine could double as a forum moderator. And you could share search engines. Get a copy of the search engine of somebody that you admire/trust and merge it with your own. Thus your search engine could learn from others what's good and bad. You could have a family search engine, passed down through the generations.