While it's necessary to have the full filesystem tree available for things like sharing files and accessing temporary items, most of the time you only want to deal with the files under the {My Files} view similarly to the Files tab in the web interface.

The new hostname "myfiles.messagingengine.com" allows you do do exactly that.  You can access it via DAV or FTP, and when you log in (still using your full username@domain and password) the top directory is your {My Files}.  We still have the dav.messagingengine.com and ftp.messagingengine.com names for when you need the full power of the virtual filesystem, but for ease of use, myfiles.messagingengine.com will save some typing!

Of course, it works fine via SSL as well.