Thanks mhab12,
It seems that ftp is old, insecure and frowned upon by today's network gurus, including the pfsense development team. Unfortunately it is still very popular which makes it hard to avoid.
I found this page with a discussion on the subject and a few alternatives to ftp..
http://blog.pfsense.org/?p=212
..some of which, SFTP for instance, can be a simple as changing a setting in your ftp client.
This does, however, require the equivalent setting at the other end of the connection, which means you have to motivate your prospective file sharing partner to include the same setting (or possibly to implement a different server application).
Cheers
Nigel
Australia