Transmit
http://www.panic.com/transmit/
© 2007 Panic, Inc. Transmit is a registered trademark of Panic, Inc.
$29.95
Easily one of the best FTP clients in the world, Transmit can do just about anything. I bought it for its superb Amazon S3 support.
Migration Score
GREAT
Migration Options
gFTP
Works great. However, no S3 support.