Cyberduck – FTP, SFTP, WebDAV, Cloud Files, Google Docs & Amazon S3 Browser for Mac & Windows.
With an easy to use interface, connect to FTP (File Transfer Protocol), SFTP (SSH Secure File Transfer), WebDAV (Web-based Distributed Authoring and Versioning), Amazon S3, Google Cloud Storage, Windows Azure, Rackspace Cloud Files and even Google Docs.
I have been using Google Docs more lately. You can't beat it for keeping information in the cloud. Cyberduck allows you to access Google Docs as in a file manager. You can download them for backup or quick use.