If you view the page source you can see this:
<title>Alice Song Portfolio
</head><frameset rows="0,*" framespacing="0" border="0" frameborder="0">
<frame scrolling="no" noresize>
<frame scrolling="auto" noresize src="http://www.dropbox.com/s/c8msm9uuew1hzzq/alice%20song%20portfolio">
That means our cloaking is working as expected, but perhaps Dropbox doesn't permit the iFrame? They say they do, but I wonder if it's because of the spaces. I tried that code on a plain html page and got the same result. A scouring of dropbox's forums show a bevy of dissatisfied people I think it's them.