O'Reilly ONLamp Blog - What ever happened to IPv5?
Light Reading - The IP Priesthood

Netatalk is a freely-available, kernel level implementation of the AppleTalk Protocol Suite, originally for BSD-derived systems. A *NIX/*BSD system running netatalk is capable of serving many macintosh clients simultaneously as an AppleTalk router, AppleShare file server (AFP), *NIX/*BSD print server, and for accessing AppleTalk printers via Printer Access Protocol (PAP). Included are a number of minor printing and debugging utilities.