This does not work for me (Gutsy on the client, Etch on the server). I have successfully exported the ssh key. So passwordless ssh into my remote box works.
As long as I keep "BatchMode=Yes" OUT of my fstab entry, I can mount the remote folder as expected: manually, as user with a simple "mount /mountpoint" command.
When I put "BatchMode=Yes" into the fstab-entry, I can no longer mount the server manually, I get a "read: Connection reset by peer"-error. Of course automounting also doesn't work.