GoFileDrop (previously called GoDropBox) is an app that adds a public mailbox to your Google Docs account, enabling anyone with the appropriate link to upload files to your account. It was previously only available to Google Apps customers via the Google Apps marketplace, but it can now be installed by users with regular Gmail accounts.
To install it, just head to the GoFileDrop site and hit the button to add the service to your Gmail account. It works in the same way as the version available for Google Apps users: Once you’ve authorized GoFileDrop to access your account, you’ll be given a unique URL that you can then forward to other people, which allows them to upload files to your Google Docs account through their browser (they can only upload files and don’t have the ability to read or otherwise access your account). The upload page is shown in the screenshot above. It is easy to use and supports drag and drop, allows batch file uploads and file deletion, and shows upload progress. Uploaded files appear immediately in your Google Docs account, and you’re also sent an email notification of any new uploads.
50 MB of data allowance is provided free. Additional data costs £1.75 ($2.86) per GB, with bulk purchase discounts.