Gawker Media's weblogs provide a simple method for including YouTube videos in comments. The example shown here is from the Consumerist blog. Users find a video in YouTube, copy and paste the permalink URL into their comment on the blog, and the video is embedded into their published comment. This method of transcluding content is popular in wikis, but the implementation usually involves using a special syntax. Gawker's method of using translating the permalink is dead simple.

1. Typing in to the comment form shows text in page above the form.
2. Pasting the YouTube permalink into the comment form. Video thumbnail appears immediately in page.
3. Clicking the "Watch video" link shows the embedded video player.
Screencast / Video

Gawker Video Commenting from jibbajabba on Vimeo.

http://consumerist.com/356756/new-feature-embed-youtube-in-comments