Download this mod
This mod adds a 'Digg This' button at the top of each topic for easy submittal to Digg.com which keeps track of the number of diggs as well.
Click for screenshot
Note: The background color for the Digg script is set to match the default SMF background color. If you want this to match any other theme you will need to edit the package and change the value of 'digg_bgcolor' to your desired value.
digg_bgcolor = '#e5e5e8';
digg_bgcolor = '#000000';