I've tried LeapFTP (It's OK), FTP Explorer (Couldn't get it to work at all), and just plain old Internet Explorer for FTP transferring, but they all didn't seem to work well. Oh, and I also had WSFTP but it seemed weird running something designed for Windows 95-98 on XP. Someone's told me SmartFTP is good, what do you all use?
The best FTP program I have ever used is one I downloaded for free. It is called AceFTP 3 Freeware. I have been using that for almost two years now.