All Info "borrowed" from other players.

Hardeners To Use
Angel - All Types
Amarr Navy - EM/Therm
Gurista, Mordus, Gallente - Kin/Therm
Blood - EM/Therm
Sansha - EM/Therm
Serpentis - Kin/Therm
Mercenary - EM/Thermal/ (Kin (missiles))
Caldary navy - Kin/Therm
Khanid - EM/Therm
Zazzmatazz - All Types
Mordus - Kin/Therm
Rogue Pirate - EM/Explo/Kin
Odamian - Kin/Therm

Damage Types to USE
Angel - EM(Shield) Explos(Armor), or Therm all
round
Amarr Navy - EM(Shield) Explos(Armor)
Mordus - EM(Shield) Explos(Armor)
Gurista - EM(Shield) Explos(Armor), Therm/Kin
all round
Blood - Therm
Sansha - Therm
Serpentis - Therm
Mercenary - Explos
Caldary Navy - Explos (Kine/Therm)
Khanid - EM(shields) Explos(Armor)
Zazzmatazz - EM(Shield) Explos(Armor)
Rogue Pirate- EM(Shield) Explos(Armor)
Odamian - EM(Shield) Explos(Armo