In a long blog post, Digg founder Kevin Rose explains why they’re removed their list of top users, who were ranked based on how many stories they’ve been able to promote to the home page. Since seven of the nine paragraphs of the post talk about the steps Digg has taken to fight spam and gaming of their system, it is reasonable to conclude that this is yet another step in that fight.
Top Digg users are often requested to help stories get the the home page, sometimes in return for cash payments. By removing the list, Digg makes it harder to figure out who those users are.
Rose also says that they will take steps to point out users who tend to vote for stories on similar topics. The goal, of course, will be to build community.