Docstoc has been around for a year or so and provides a place to share your documents and view them online. Now they have releasd MyDoc which trasitions to a service more like Google Documents with a few added features.
The difference lies in that Docstoc My Documents will provide you with unlimited storage for all the documents you can throw at it. The program also provides a sync program which allows automatic syncing of your documents from 1 PC to another without you having to do anything except the initial setup.
The interface provides you of a thumbnail view of all of your documents and also quickly opens once selected.
The service is free and is available on Windows and Mac [Here]