If you want, you can configure your machine as an FTP or HTTP server. Please remember that running these services may introduce security holes, and may also slow your machine down. If you still want to run them, though, it is easy to do so.
To run an FTP server, install the packages wu-ftpd and anon-ftp, and put the files you want to export in /home/ftp/pub. You also need to uncomment the line referring to ftpd in /etc/inetd.conf by removing the # at the beginning of the line and to restart inetd by running the command kill -HUP pid as root, where pid is the process ID of the running inetd process. (If you do not understand this, you can also just reboot after editing /etc/inetd.conf.
In general there is no reason to run a nonanonymous FTP server; you can always FTP to your account at ftp.dialup.mit.edu instead or use rcp. Nevertheless, it is possible; to do so, you have to follow the above instructions and then run /usr/bin/passwd to set a local password. (You need to do this because ftpd doesn't deal with Kerberos. For that same reason, you will not get tickets this way.)
To run an HTTP server, install the package apache and put the
files you want to export in /home/httpd/html. (Icons can go
in /home/httpd/icons, and CGI scripts
must go in /home/httpd/cgi-bin.)