Proposed Redesign of the Dropbox Homepage
forrst.com
forrst.com
It should be very clear for first-time visitors what to do. Existing users already know what to do, so it is fine for their action (login) to be tucked away in the corner.
Dropbox doesn't want first-time users to decide what (if anything) they should be doing with those login boxes.
But then again, the true test is of the A/B variety!