Omnisio: Online video editing

Omnisio is an easy way to edit videos online. For example, you can take a few Youtube videos and splice them together. Academhack found another interesting use for Omnisio:

Omnisio solves one of the problems with making your presentation available online. Before you had to either sink your audio to the slides, and not show yourself talking, or show the video of your presentation at the expense of not always being able to see the slides. No longer. Omnisio allows you to synchronize the video with the slides and show both.