not as far as I know but considering I'm never likely to have an iPhone it doesn't really bother me. My own nas can be access from online via ftp server and though a web address (although that currently points to its web server) - iphones can do ftp I assume or is that a winmo (pre 7) symbian and android trick
I have been using mine, signed up to it ages ago, no bonus from me Harry, seeing this reminded me I had it.
It's been great for sharing larger groups of files with clients! The album artwork I am doing now has required (I say required, I just got snap happy) nearly a thousand photos. There is no way I could have got those to him easily without dropbox!