"Amazon Zocalo is a fully managed, secure enterprise storage and sharing service with strong administrative controls and feedback capabilities that improve user productivity.
Users can comment on files, send them to others for feedback, and upload new versions without having to resort to emailing multiple versions of their files as attachments. Users can take advantage of these capabilities wherever they are, using the device of their choice, including PCs, Macs, and tablets. Amazon Zocalo offers IT administrators the option of integrating with existing corporate directories, flexible sharing policies, audit logs, and control of the location where data is stored. Customers can get started using Amazon Zocalo with a 30-day free trial providing 200 GB of storage per user for up to 50 users."
Amazon Zocalo rocks Box, socks DropBox, clocks Google Docs • The Register