The tool I would most likely use to try out is Videonot.es because I have taken a couple online classes, and it is definitely difficult to go watch an online video and have to take notes by hand, because usually the video takes up your full computer screen so you cant type notes. Similarly, I like the idea of being able to go back through the video with your notes so that if you take a note, you are able to figure out what the note was about. You can also use this to help show others what you were trying to say without having to spend several minutes looking through the video.
I found it interesting because it is a well thought out concept, and I think could be very helpful with online classes. I have also had some classes where we are asked to watch educational Youtube videos and take notes about it, and I think this tool would be perfect for that. It seems pretty easy to use, and very useful.