Many of us transfer files using FTP method.
For this purpose a very simple and useful tool is the FireFTP Add-on of Firefox.
FireFTP - The Free FTP Client for Mozilla Firefox
It works on Windows, Mac OS X, Linux; practically any platform that can run Firefox.
It supports IPv6 & proxy.
It can manage multiple accounts. The passwords can be saved locally or typed everytime.
It is possible to control the format of transfer, i.e. Binary or ASCII modes.
It opens in a new tab with two panels, computer in Left and the destination server in right.
Transferring files is as simple as the click.