I couldn´t find a written descrition in mediasilo´s site so I am quoting another one I found on a different site:
"MediaSilo helps to significantly streamline the post-production process by enabling better communication between client and vendor. Users visit a website where they access video clips that can be annotated and approved. Editors can then export the feedback and continue work without the need to burn and ship DVDs and then wait for days to receive feedback.
Originally developed in-house and only available to our clients, MediaSilo's online collaboration, video asset management, and web-broadcast tools are now available to anyone at http://www.mediasilo.com.
The bottom line is a shorter post-production period that saves valuable time and helps reduce project timelines, better overall communication between all stakeholders, and more transparency into post-production."