OpenSSH 5.7 just got released. You can read the full announcement at http://www.openssh.com/txt/release-5.7. Personally I especially appreciate the following improvement to their SFTP stack.
sftp(1)/sftp-server(8): add a protocol extension to support a hard link operation. It is available through the “ln” command in the client. The old “ln” behaviour of creating a symlink is available using its “-s” option or through the preexisting “symlink” command
Being able to handle hard links definitely makes SFTP even more useful as a remote filesystem.