and here it is!
BASE DEFENSE BONUS:
DM Note: The following rules comes as a set for the maintenance of game balance.
1. Basics
Base Defense Bonus is a class and level dependent boost to AC as a dodge bonus. This bonus is denied if you are wearing any armor, carrying more than a light load, or denied your dexterity modifier to AC. This bonus is calculated by the following equation:
Base Defense Bonus = Base Attack Bonus + Base Reflex Save – Character Level
Your Base Defense Bonus is a minimum of 0 (it cannot penalize your AC).
2. Armor to DR
You receive DR/– equal to half your armor AC (rounded down). If you are wearing adamantine armor, you receive DR/– equal to your armor AC instead.
3. Mage Armor
Mage Armor, Bracers of Armor, and similar spells and items no longer grant armor AC. They now grant deflection AC instead. Armor AC may only be gained through real physical armor or magically enhanced clothing (e.g. +5 robes)
DM Suggestion: Arcane spellcasters who do not benefit from Base Defense Bonus should invest upon Twilight Mithral Chain Shirts (0% ASF).
SPELLS SECTION:
8. Bonus Type Clarifications (Also for Items):
• Armor bonus are no longer granted by spells as Mage Armor or items as Bracers of Armor, instead they grant deflection bonus.
• Deflection bonus to AC may be up to +10 for non-epic equipment and costs (bonus^2 x 1,000gps)
as most of you already have Bracers of Armor or Rings of Protection, this will require some upgrading:
If you have Bracers of Armor (or similar +AC mage-armor-ish effect), change it to deflection instead, simple enough.
If you have Rings of Protection (or similar +deflect AC), double the bonus (do the math and you'll realize you're on the high end of the bargain stick here so I don't want to hear any complaints

My custom Arcane Armor spells are hereby declared obsolete...
also, an PHBII feat I edited for the new armor-to-DR rules. This + adamantine makes wearing armor actually well worth it

ARMOR SPECIALIZATION [FIGHTER]
Requirements: Base Attack Bonus +12, Proficiency with selected armor type
Benefit: Choose light, medium, or heavy armor with which you are proficient. When wearing masterwork armor (including magic armor) of that type, you gain damage reduction equal to armor AC instead of half armor AC. Any time you lose your dexterity bonus to armor class, you lose the benefits of this feat.
Special: If you wear adamantine armor, you gain damage reduction equal to one-and-half times your armor AC instead of your armor AC.