Flash FXP is an FTP client with all necessary functions, also letting you transfer files from a remote server to another without having to download the file to your PC first.
Normally a server to server transfer is much quicker, so you can take advantage of your broadband connection.
FlashFXP has an interface similar to Windows explorer and allows file drag functions. Also, if you disconnect while transferring a file, FlashFXP will automatically reconnect and continue the transfer.
Among its characteristics are the ability to continue cut transfers, disconnect automatically once finished and much more.