Mozilla Popcorn Maker is a video editing tool that allows you to “enhance and remix” existing video content. You first locate the online video file that you want to edit, and then using Popcorn Maker’s editor you can add text, Wikipedia content, images, Flickr galleries, Google maps, Twitter feeds, and video effects (like pauses or loops). Popcorn Maker is a great tool to create a Pop-up Video style of video, complete with annotations of your choice. Here is an example: http://popcorn.webmadecontent.org/imd.
Check it out here: http://popcorn.webmadecontent.org/