woork, a blog that has some very nice web resources, shows how to create the famous digg-like navigation with a tutorial & source files.

The tutorial also explains how to create liquid & rounded corner items that you may find useful.

Drupal, which is one of the most powerful & free content management system has a new module named Drigg for creating Digg-like websites.
Unlike other Drupal-based solutions, Drigg only needs:
- VotingAPI — a powerful Voting API available for Drupal.
- A voting form based on the VotingAPI. The forms of choice are provided by Extra Voting Forms.
- The User Karma module.
