Vidbolt and VideoANT

Vidbolt is what I have always been looking for - a way to annotate YouTube videos. This has great potential for teaching, for example:

• The instructor can annotate a video to ask questions, provide context, or offer additional explanation.
• Students can find, annotate, and share videos as part of class projects or exercises.
• This should work well for flipped classes: students can watch and annotate the videos in preparation for class.
• ProfHacker has nice review and Jonathan Senchyne explains how to use Vidbolt in teaching.

VideoANT is another excellent video annotation tool by the University of Minnesota: just authenticate or enter as a guest, copy/paste the URL of the video, and annotate!