If you are an artist, or maybe a designer or something like that, I can imagine the online editing tool released for youtube can really help you out. If you are an average person, I wonder what you need the app for. It is here though :

YouTube has begun offering a Web-based editing tool that is apparently provided by Adobe Systems.

The "remixer," which is branded with an Adobe logo, enables users to create more professional-looking videos by splicing together media such as video clips, photos, music, graphics and other effects, according to information found on the site. (WebWare)

Although it is a great step forward technology wise, and therefore justified, I have no idea who will use this. As I said before, I think artists and such will be the target. Would that market be interesting enough to develop and release this ? Or is it merely a showcase for adobe ?

Your opinion is welcome in the comments.