These seem great, but I truely think the biggest thing they could do would be add a line at the top of the page encouraging people to visit /newest. The content that actually makes the front page is somewhat random. I've seen the same thing posted several times, only to have the third posting be on the front page all day. Its also true that much of the content which does make it there is gamed by people who have their friends upvote. Getting more organic votes to new traffic would make that much harder.