"The best articles are voted to the top by the community, but in a way that makes it difficult to game the system. Instead of being able to vote up your own articles or those written by your friends, readers are given a random sample of articles and asked to compare them in pairs. This A-B approach filters the best articles to the homepage."

This is cool; variations are used by recaptcha, etc. I wonder if this could be used by digg? Increasing the quality/reducing gaming of community-based ranking seems like a very good idea.