Pader Sync has had a BlackBerry smartphone FTP and SSH client for awhile now but they have recently taken a stab at the PlayBook. Their latest offering is Mobile FTP which obviously allows you to connect to remote FTP servers including ones with SSL/TLS, Zlib compression, and other features. It also has some cool features like password protected access to the app and automated one way file sync.
Check out Mobile FTP in App World for $0.99
