As I reported yesterday at Search Engine Land, Yahoo Launches Suggestion Boards - Digg Community Upset. In reality, Yahoo! had these "suggestion boards" for a while, at least a few months. But Yahoo! officially announced them two days ago.
As you can see by the screen capture above. Users can submit "suggestions" and then other users can vote on those suggestions, so that Yahoo! can determine what are the most wanted suggestions out there.
Digg has the same model, but are conceptually different, in that users vote on news stories.
So if you want a new feature on a Yahoo! property, you add the idea to the list and hope others want it as well, and vote for it.
In my opinion, this is very different from Digg.
So go ahead and vote at the SiteExplorer Suggestion Board for your favorite feature requests.
Forum discussion at WebmasterWorld.