i.Ftp is a little graphical FTP/SFTP client, which does what I need in an FTP client without the size and fuss.
i.Ftp is designed to work from portable media like USB keys as well. It doesn’t store anything in the registry and will find it’s resource files and options via relative paths. A full install is about 900kb so it doesn’t eat up much space on your portable storage. If you don’t need SFTP support then you can delete libssh.dll and libeay32.dll to make it even smaller!
Download: i.Ftp 2.11