Dropbox Forms is a free service (built into web form creation tool, JotForm) that creates a web-based form that anyone can use to upload files directly to your Dropbox folder.
Simply click the Create a Dropbox Form button and grant the service access to your Dropbox account (you can revoke access at any time by logging into your Dropbox account and visiting the My Apps tab of your account settings). Once you've done that, the web app will provide you with two options: either a direct link to a form hosted on JotForm's website, or embed code you can use to put the upload form on your own site.
When someone uploads a file to your account using Dropbox Forms, it automatically syncs to your Dropbox under DropboxJotFormSend a File. If the person who sent the file filled out the accompanying form, the synced folder will also contain a PDF listing the submission date, person's name, email address and a note (if they added one). Whether you work in a field where you need clients to send you occasional files or you just want to give friends a quick shortcut to send you files, this is a really clever solution.
Dropbox Forms [JotForm]