YouTube Interactive Television

-Add background information about the video.
-Create stories with multiple possibilities (viewers click to choose the next scene)
-Link to related YouTube videos, channels, or search results from within a video
-All of the above!

You control what the annotations say, where they appear on the video, and when they appear and disappear.”

Link: http://www.youtube.com/t/annotations_about
Demo: http://www.youtube.com/watch?v=VtQg_LCq_T8&fmt=18