DISQUS is a popular "social commenting" platform. It is integrated with many hosted blog platforms and open source CMSes, including Drupal. A client of ours exported the comments from their old Wordpress blog and then imported them into DISQUS.
During performance and scalability reviews of sites, we regularly find ourselves submitting patches to contrib modules and core to resolve performance issues.
We are looking to pay talented authors to contribute articles to a print Drupal magazine. Issue #1 will be distributed at the Chicago Drupalcon, and will focus on Drupal 7.