One of the features I was looking forward to with MobileMe is the ability to send large files without bothering with FTP. There is supposed to be a feature that allows you to easily email a link to a friend that allows them to download the file directly from you MobileMe storage.
Unfortunately, Apple has yet to flip the switch on this feature. However, this is already available on SugarSync. You can even send a file from your iPhone. That is actually an impressive trick over the lunch table.