Serv-U FTP is good as well. And yes, be sure to forward port 21. Its pretty easy to set up actually.
Systems Running F@H:
AMD: [A64 3200+] [XP2800+ x2] [XP2400+]
Intel: [P4 2.8 x4] [P4 2.0] [P4 1.8] [P4 1.7] [P4 1.6 x2] [P4 1.4M] [Xeon 1.0] [Cel 1.0] [P3 ??]