Vidinotes is a site I just learned about from the excellent blog, Zarco English. This is a site which lets you comment on uploaded videos (flv. format only) in text/audio, and then create a PDF of those notes.
The reason I like Vidinotes so much is because of how easy it is, and that there is nothing out there quite like this.
Below is a screen shot of "capturing" video to turn into notes....
Give Vidinotes a try by clicking here.