A lot of things effect Search engine optimization. Digg is not really one of them, but an excellent way to get traffic to your site. If 15 people here would get digg accounts and we could synchornize a digg, we'd get it on the home page and it'd 100k+ hits very quickly.
I agree on the notion of needing a massive writing staff. That's why we need to focus as a group on improving the quality of the initial post on a topic, and posting a quick hitter of that topic on the homepage.
I'm not confident the Admin likes my ideas, but if he was smart he would trust me because I know a thing or two about designing and activating web sites