Political, business and electronicy posts - such as iphone, ipod info get a lot of views. You really need to get about 100 diggs within one hour to potentially hit the home page and then you will see thousands of hits. Money2spare made a post about digg domination, I taught him everything he knows so read his post, try to create a number of accounts with 500+ friends - share with everyone and hope that your story gets shared by others and goes viral. I use digg more as a tool to hit the SERP's within one hour for less competitive keywords with a decent search volume - don't really see much traffic unless i get 250+ diggs & hit the homepage