This site is a Drupal 7 site that uses news aggregation about augmented reality. The point of the site it to present clips of recent stories and links to articles about augmented reality.
Also this site auto tags incoming stories using a service. The tag category page contains all the tags that contain story links thus far.
Sites:
http://superpowerplanet.com
http://emutile.com
Comments can be made on the story clips and long as the comments are legit. Working on a submission page so users can submit augmented reality content moderated.
The main reason this site exists is to test how well selected Drupal 7 modules work. So some features are included specifically for that reason.
Modules used are the standard SEO modules, as well as OpenCalais for auto tagging.