OneButton FTP is a graphical FTP client for Mac OS X with a strong emphasis on simplicity, drag and drop usability, and file queuing. It allows you to easily transfer files to and from remotes servers, such as the ones hosting your website, simply by dragging files to and from your computer.
OneButton FTP costs nothing; it is completely free. It contains localizations for English, French, German, Italian, Japanese, Spanish, and Swedish. It supports both unencrypted FTP and FTP over SSL transfers.