Make it unusual and quirky digg users love article about random things , browse through the top articles you will find alot of them are about random things or things out of the ordinary. Write about Kevin Rose the diggs creator Digg loves articles about him of course, so find latest news on him or about how he is doing some new and your can be sure it will get lots of diggs. Microsoft stuff up’s or bad things about them, Digg users for some reason have a big gripe with microsoft so will do everything in there power to make there stuff ups known to the world. Human Interest write about how so body has been done wrong by Digg users love this and will go out of there way to make sure your story goes to front page of , so make a good story up and stick ads on your site you are laughing. Try these small things for articles and will help you go to first page of digg.
Pretty basic and general. You'll know this if you went to Digg at least once, but good for the users who haven't ever gone to Digg before and don't know what it is.
And be prepared to handle the traffic that it could generate. I had a friend get pranked by his office and they created a site with the results. It got posted on digg and on fark. Site was down very quicky and people don't like that too much