Konqueror? I use konqueror to FTP up & down from my website without any problems. Something that is also neat is that any KDE application can use KIOSlaves. For example, you can open Kate (a text editor) and open a file from a FTP site by typing ftp://some.site.com/pub/file or by dragging & dropping the file from Konqueror into Kate. You do not need to first download the file & then open it.