Sep 10
Yahoo! Buzz is Digg-type place where users can vote stories by approved publishers It is now open to all users. In the past this site was a invite only place so only few could post buzz-worthy content but now it’s open to the rest of us.

So, you just sign in with your Yahoo ID and “buzz up” stories that causing them to move up in ranking. There’s not much more to explain. Stories that make it to the top of the list will be featured on the Yahoo homepage potentially driving serious traffic to the site.
You can submit stories or join the mailing list to find out when Yahoo will add new publishers to the network it pulls Buzz content from.
If you are bored with Digg then Yahoo! Buzz can be an all new experience. All you have to do it login through your Yahoo! ID.