FTP sites are archives of various types of files. You need a file transfer program, such as ftp, WS_FTP, or Fetch, to retrieve files from an ftp site. See the ftp section of the EFF's Extended Guide to the Internet for background information.
American Numismatic Association
<ftp://money.org/ana/>
Press releases, Money Talks transcripts, part of the ANA library catalog, a good selection of images, and some PC software.
Coins
<ftp://cobra.uni.edu/coins/>
Archives of messages to the Coins mailing list.
Numismatica
<ftp://ftp.limunltd.com/numismatica/>
Original text versions of various numismatic FAQs, glossaries, biographies, writings, and announcements.