I would go the web services route. Setup a page that authenticates with a key, e.g. http://www.yoursite.com/download.php?key=ds2j348sdrj43
There might be (and probably is) a better language to use than PHP for this.
Then use Insert from URL to pull the data down to a text field.
There are numerous guides in how to parse and process array data in FileMaker, so that part should be relatively easy.
excellent, thats a great tip about the authentication code, i never thought of that! thanks..
Just a bit of security just in case.