BubblePLY & Screenr

BubblePLY is a very cool annotation tool for online videos.  It accepts more than just YouTube, but it makes no guarantees about those it will accept.  I suppose you'll just have to try it out and see.

BubblePLY enables you to put text annotations, subtitles, and even images and video on top of the video.  This is a great tool for teachers.  Imagine the benefits of being able to annotate instructional videos.

Here is a sample (though, not good one) from my personal video collection:

[edit - The embed doesn't seem to work, which is unfortunate. I hope that they fix this. Here is the link to the video.]

Here is a screencast of the process done with Screenr.  You'll notice the audio isn't very good.  I think that's my microphone (and/or audio card).  Both BubblePLY and Screenr is a great job, though.