Architecture for Simple document System, prototyping

We have an existing application (web based c#, Jquery) that uploads and stores documents in a SQL database. These documents relate to objects (like tasks, process etc…) We find our current process very user unfriendly. We would like to see a solution that allows the end user to edit docs online, maintain document properties and keep the link to our objects in our sql database. We are thinking on MS solutions and/or interface Google docs… Your task? [login to view URL] feasible architectures 2. Outline needed requirements 3. Create prototype (simple proof of concept)