I've been seeing the Yahoo Buzz button around on blogs. About a week Yahoo's Buzz became available to all publishers. They started with a select group but you can use it now too even though it's still in beta.
Yahoo's Buzz is very similar to Digg's service but in a much bigger way. The audience is incredibly large. Yahoo is putting the trends of what people are searching for on their home page which sends huge amounts of traffic to the articles that people have buzzed up & chosen as popular.
Users can't submit your own articles but you can put the Buzz button on your posts & encourage your readers to buzz them. Because the posts have the potential of sending 10 times the traffic that Digg posts do it seems lucrative. (And that's assuming that the post has made it to the Digg front page).
You can also host a Yahoo Buzz widget on your blog or site. This would continually refresh the news stories that people have voted for.
For further reading ProBlogger has an article on it.