I would use your hardware firewall to block out all traffic to the ftp server from anybody, except the ip of the machine you use to upload the web content. If that machine is sitting on the private port of the firewall, outside hackers will not be able to sniff on the password which does get sent in open text like telnet. They will not be able to spoof your ip to get in either, as the firewall will detect that ip to not belong to the exterior port, and drop the packet. If your workstation is on the exterior, however, you might want to consider using some sort of secure ftp, as others would potentially be able to see your password.
Vidar