The Blogger Hacks Wiki continues to roll on, gather steam & justify our faith in the format. The latest addition, courtesy of Tom Thomas, is a method for adding a full-service Digg It button to your post footer. This hack suffers from the same chicken / egg issue that other efforts do....
Chicken: You need a published post to bookmark something to Digg.
Egg: You need the URL of the dugg story before you can add the button....
This, however, is not Tom's problem, and his workaround has the required outcome. Perhaps a little too much effort if you're looking to have every story dugg, but if you want to raise the profile of a few key posts, this is a workable option.
Update 9/23: As Ariel points out in the comments, there's a Feedburner Feedflare by Ross Belmont that will include "Digg It" links on your posts. For instructions on adding Feedflare to your blog instead of / as well as your feed, see Feedburner's quickstart.
Filed in: social-bookmarking blogtech digg wiki