Drupal Sun is an Evolving Web project. It allows you to:

• Do full-text search on all the articles in Drupal Planet (thanks to Apache Solr)
• Facet based on tags, author, or feed
• Flip through articles quickly (with j/k or arrow keys) to find what you're interested in
• View the entire article text inline, or in the context of the site where it was created

See the blog post at Evolving Web