preatty usefull frame.io video collaboartion solved!!!!

Frame.io acts as a home base for all your creative projects. It replaces the hodgepodge of using Vimeo, Dropbox, and Gmail to work with media files online. We solve cloud storage, client review, transcoding, and light asset management into one seamless app. We have great tools for video like time based comments and annotation so you can draw directly on video frames. We have version control and comparison tools built in so you can see what’s changed over time. Frame.io is social too. Every action performed is tied to an individual user and tracked so you get notifications about what’s going on. It’s built for teams from the ground up so you can create a private workspace for each project you’re working on and decide who has access to what.

http://frame.io/