Kaltura is an online tool that allows groups of people to make videos together in their web browsers.
You can post your Kaltura interactive video player (looks like a YouTube video – except it’s editable) on your blog, from where you can invite other people to add more video, sound or pictures. You record directly into the video player on your web page and new content is added to the end of the video. Very clever.
Watch the Kaltura video tutorials
It looks awesome.