Annotate that!

YouTube now lets you watch video that has been annotated, click on annotations and interact with the video. The feature went live yesterday, and the blog world has a number of articles 1, 2, 3, ... and examples 1, 2, 3, ... including a how-to (how-to video). Now video uploaders can annotate the videos, set up branching storylines on top of their video collection etc. Let the fun begin!

ps: Loved this test drive. Watch it on high quality.

UPDATE: If you build it, people will play, hack, subtext, and lyric Britney (I am waiting for a Shakira).