One of the most disliked tasks for individuals, the crowd is very good at organizing huge amounts of data.

Examples:

• Google’s winning search technology is a radical departure from other Internet search engines. Google interprets links on web pages as votes. The more links that point to a page, the more likely it is, that page contains what you are searching for. Google also analyzes pages and ranks them by ‘importance’, links from important pages carry more weight than unimportant pages

Google’s page rank technology explained http://www.google.com/technology/