I always end up using some other service to send files because of the huge Login/Signup screen that appears upon clicking the download button and the actual download button is bullied to the bottom of the screen.
It's really embarrassing, you're purposefully deceiving the user who I send the download link to by making them think they have to sign up to get the download link. The font size and overall design of the page is purposefully designed this way, it's unacceptable.
Until this is improved, I'm no longer using dropbox to transfer files. This is not a real feature. This is just me looking like an idiot in front of my clients, apparently trying to advertise dropbox to them.
The download button should be clear and centered; the signup options should be somewhere away from the main space such as the top right.