I'm a freelance Drupal developer who loves enabling organizations switch to free and open source software.
I posted an article on the CivicActions blog about posting recorded videos as comments. Follow the "Continue reading" link to see the complete post.
More and more web publishing platforms are starting to integrate video comments. YouTube and TechCrunch use them and embedded commenting systems like Disqus make it really easy to enable them on your site. Drupal has its own ways to provide integrated video comments, although most solutions are currently only available for Drupal 5.