Goodbye File Sharing control panel, hello Sharing pane. From here you start up File Sharing -- but be warned that this is TCP/IP-based sharing only. OS X doesn't share files via AppleTalk.
More intriguing are the checkboxes below -- you can turn on remote Telnet access, allowing remote users to log in to your Mac's new Unix command-line interface (and do a great deal of damage, potentially -- turn this item on at your peril). You can also turn on Mac OS X's built-in FTP server, allowing file-transfer access for a wider range of platforms and users than Apple's standard File Sharing.