gDocs Uploader is a simple desktop client to quickly upload files to Google Docs online account. Once you have logged into tool using Google Docs login details, just drag drop files to start uploading.
Windows and Linux users can install Adobe Air version of this program. MAC version of this tool if also available to upload files to Google Docs account from MAC OSX system. It has very simple interface and allows easy uploading of documents to online Google Docs suite account.