I don't use ftp too often. But from what I know, smartFTP and filezila are two good ones. There is this other one called CoreFtp. Its good but its a bit complicated.

WS FTP is the best! Ease of use, great UI..what more can i ask for?

WS_FTP is nice - after all, the educational edition is free to students (or at least was a long time ago when I downloaded it) - can you complain for free? :)

Smart FTP is my favorite as well...though I'd rather use SSH whenever possible.

Ive only ever used one, was called ACEFTP or something, did the job pretty well.

I also use SFTP for that very reason.

Same here. Cute FTP Pro is what I use to connect via SFTP. SFTP, for anyone who does now know, is FTP over an SSH connection. SSH does basically the same as Telnet, but it is secure.

FileZilla is a free FTP program that also supports SFTP. I recently tested it out before recommending as a free SFTP solution to a friend and it seemed to work perfectly.

Ive used only a few. Core FTP is the one im using currently. It's free, and It's been doing everything I need it to do =)

I use Flash FXP
I just love it.