A trust engine - somebody will get rich on it
when i type whatever in google or my favorite search engine, it would be nice if i could get the results of what everybody else did morphed into mine and displayed as what others thought was useful. if you typed in looking for websites on MP3 players to pick a bad example, i'd like to have the results displayed as X number of people thought this site was actually useful as well as linking to these sites.
and then rank those by how many people agreed with that ranking. a giant feedback loop that allows 'smart' people to bubble up to the top.
and another thing. if i want to buy a new coffee maker, i really don't care what some so called 'expert' says. naah, i want to know what the consumers who already own them say. today, it's too hard to entice people to fill in what they like, what works for them, and what hints/tricks/tips are useful. lots and lots of businesses (aka dot bomb) have gone after this in some fashion, mostly failing..
solve this problem and you will get rich because my time and my money are worth something to me. get me better value/satisfaction for my money in less time and I will pay for it. so will others.