The Unofficial Twentieth Anniversary Mac Site
A wonderful site that complements this one nicely. Includes discussion boards.
Other Worthwhile Links
Macintouch - The Ultimate Daily Mac News Source
Other World Computing - These guys still have EDO ram for the twentieth.
Bungie - Makers of Myth & The Marathon Triology. Simply the best mac games you can buy. Now part of the microsoft empire, but their old stuff is still worth picking up.
Gathering of Developers - If you haven't yet played Railroad Tycoon II, you're missing out!
Online Bible - A great resource tool available for the Mac.
Java on the Macintosh - All sorts of useful stuff for Java on the Macintosh