Gladinet Cloud Desktop

Gladinet Cloud Desktop mounts cloud storage as local folders* and integrates online applications (Amazon S3, Google Docs, Google Picasa, Box.net, EMC Atmos Online, FTP, WebDav, and more …) with the local desktop.
It is a personal cloud agent, an open online backup platform, and a desktop delivery agent for cloud service providers.

http://www.gladinet.com/