This isn't a Handbook. There will be no ratings as you would find in a traditional handbook. There is, however, color-coding for three types of items that are worthy of noting. In an effort to alleviate confusion with normal handbooks, I've chosen three colors normally not utilized.
Green -- These items are options that contain multiple damage types concurrently.
Orange -- These items are options that contain multiple damage types, but independant of each other.
Brown -- A new color has been requested to denote options amongst magic items that are properties/etc that provide for constant element-changing or element-adding
AP - Arcane Power
AV# - Adventurer's Vault
DP - Divine Power
Dr### - Dragon Magazine Issue ###
EPG - Eberron Player's Guide
FRPG - Forgotten Realms Player's Guide
HoFL - Heroes of the Fallen Lands
MotP - Manual of the Planes
MP# - Martial Power
P1 - P1 - King of the Trollhaunt Warrens
PHB# - Player's Handbook
PHH - Player's Handbook Heroes
PHRD - Player's Handbook Races - Dragonborn
PHRT - Player's Handbook Races - Tiefling
PrP - Primal Power
PsP - Psionic Power