Youtube implemented the "deep link"-Feature which appeared in newsofthefuture in 2007. The predicted date was quite accurate (October 20th, it was introduced on October 30th) but the year was one year too early. It was introduced in 2008.
Now it's possible on Youtube to link directly to a specific timepoint in a video. So you can refer to a particular section of a video.
Argument: I guess this is a need for people to link to specific timepoints, like linking to anchors in HTML-Files, especially for longer videos (I already had the need). I was inspired to this idea by the TED-Videos, which are seperated in different chapters.
Current development: Viddler (comments for specific timepoints in videos)