November 6th, 2004 Update
Today, it seems that the banning system that MS has implemented has been changed. The current rumor is that MS is banning both the Xbox EEPROM and the XBox HD when Live is accessed with enabled modchip on Xbox Live.
This topic will be updated when more helpful information is released. For now, best to read the newest topics.
Below, are topics that I feel are still important to Xbox Live. The first topic, regarding how to use XBox Live on a modded Xbox, is still helpful.. unless you get banned.
Tutorial - How to Play on Xbox Live with a Modded Xbox
Do Not Use Eepromer
Tutorial - Replacing your EEPROM using Configmagic Final
Fix a Bad EEPROM Flash
How To Block Xbox Live On Your Router
Xenium Issues with Xbox Live - You might not be banned
Linksys WRT54GS Help with Xbox Live