EmbedPlus

This is a free flash based tool and it allows users to seamlessly and freely upgrade video embeds with attractive features that the standard YouTube players does not currently offer.  It has features like scene skipping and 3rd party annotations, movable zoom, slow motion, chapter/scene skipping and embedding. This would be useful for marking up lecture, demo, and experiment videos – even for videos not created by the teacher.  Similarly, slow motion and movable zoom can offer needed accessibility for some students and video events.

I've not yet had a chance to try it myself but it does look very interesting indeed. If you do use it, or try it out, please leave comments!