This page is just getting off the ground. It will hold information about the Debian AMD64 porting project.
There are also helpful people on #debian-amd64 on irc.debian.org.
General Links
Documentation
The Debian GNU/Linux AMD64 HOW-TO. (Broken as of 20110729. FilipusKlutiero)
Compatibility List, local version: /Mainboards. Please cooperate!
DebianAMD64Faq, possibly outdated.
Dual arch (AMD64 / IA-32) Installation, Documentation on how to make both archs work together and transparent to the users.
Dual arch (AMD64 / IA-32) Installation (Brazilian Portuguese), Translation of the above.
Miscellaneous
AMD64 port has finally become official. Here is what you need to do to your sources.list for the ?DebianAMD64MirrorMove (i.e. switching from an unofficial to an official mirror).
Development
VerifyPAS, list of packages (erroneously?) tagged not suitable for AMD64 in P-a-s. Your help is required!