Lately I’ve been obsessed with the power of lists and leaderboards. I think smart lists are very, very powerful and this is something that can make or break a website. There’s almost a book in there, but I’ll keep that one for a rainy day :) Here’s a good description by Lucas of the (ex) webJay algorythm, including a discussion on feedback loops (what’s popular stays popular because it’s on the most popular list).