Can you a suggest a best FTP Client (File Transfer Protocol)??  

I'm a big fan of CuteFTP. It's free, and it's a fairly simple program for basic FTP transfers. It's also got enough meat to do some more complex work if need be.

I've also used FireFTP (an add-in for firefox). It works just about as well as CuteFTP has for me, so I'm happy with it.

Those are the ones I'd recommend. They're free.. and both pretty easy to figure out.

I really suggest filezilla since its opensource

FileZilla is a free, open source FTP client for Windows. It supports FTP, SFTP, and FTPS (FTP over SSL/TLS). As of March 1, 2007, it was the 13th most popular download of all time from SourceForge.net [1].

The main features are the site manager, message log, file and folder view, and the transfer queue.

The site manager allows a user to create a list of FTP sites along with their connection data, such as the port number to use, the protocol to use, and whether to use anonymous or normal logon. For normal logon, the username is saved and optionally the password.

The message log is displayed along the top of the window. It displays the console-type output showing the commands sent by FileZilla and the remote server's responses.

The file and folder view, displayed under the message log, provides a graphical interface for FTP. Users can navigate folders and view and alter their contents on both the local and remote machines using an Explorer-style tree interface. Users can drag and drop files between the local and remote computers.

The transfer queue, displayed along the bottom of the window, shows the real-time status of each queued or active file transfer.

Best is Cute FTP. Its free and easy to use

Base on experience, CoreFTP is the best FTP for me. Try it.

I've used smartftp and cuteftp and find both quite useful. Once I've started using firefox as my default browser I've just started using fireftp - a FF extension which makes it very convenient.

I would suggest you to visit www.ftpplanet.com and get familier with the whole things.There are plenty of FTP Clint like Cute FTP.

As a webdeveloper, FTP Program is important to me.
Yes you can use IE's FTP but it's quite slow cuz it's transferred via HTTP. FileZilla is great and also FREE. If you want to save some bucks go for Filezilla. LeechFTP is also FREE and similar performance as Filezilla. But the most great FTP that I ever tried and even used it for the longest time is CUTE FTP Pro of Globescape. The best? Cute FTP!

I have been using a free FTP client called CoreFTP which is a quite decent software considering it is free to use and does its job clutter free and efficiently. I had no issues with it so far. I used to transfer lots of files between friends and found it useful. I would suggest you this if you are interested.