And as I am reading Citizen Marketers at the moment, this seems to be topical — especially given that the subtitle is "When people are the message". Mojiti allows you to create a narrative overlay to your videos … and also allows others to contribute to this. You WILL need to sign-up, but then you will be able to add your comments to this video.
And while the technology is cool … I particularly love the way that Michael Wesch has pulled together a compelling storyline integrating message and medium. The possibilities that this opens up for digital storytelling and brand engagement/promotion (in particular) is considerable. Of course, this will not be without risks … but then, neither is crossing the road.