I saw a link the other day to an interesting project on Codeplex.  Mikael Håkanssons has published a project called the BizTalk Sftp Adapter.  You can find out more information on his blog. 

There is a lot of confusion about what is "Secure FTP".  Most people don't realize that there are primarily two different ways of securing FTP. 

• FTPS or FTP over SSL uses the SSL/TLS layer to encrypt the FTP traffic.  It is similar to HTTPS which web browsers use to secure HTTP.
  
• SFTP or FTP over SSH tunnels FTP sessions over an SSH connection.

So next time you're asked about secure FTP, be sure to find out which one they are referring to.