Gurista/EoM: 0.75 kin / 0.25 therm
Angel: 0.7 exp / 0.2 kin/0.1 em
Sansha/Blood raider/Amarr empire: 0.5 em / 0.5 therm
Serpentis/Caldari state: 0.5 kin / 0.5 therm
Gallente federation: 0.5 kin / 0.4 therm/0.1 em
Minmatar republic: 0.5 exp /0.2 em /0.2 kin / 0.1 therm
Mercenaries: 0.5 therm / 0.3 kin / 0.1 exp / 0.1 em
Rogue drones: 0.7 exp / 0.2 kin / 0.1 therm

Main Damage types to use on npc factions:

Guristas - Kinetic
Serpentis - Thermal
Mordus - Thermal & Kinetic
Blood - EM & Thermal
Sansha - EM & Thermal
Angel - Explosive
Mercenary - Thermal
Corpum - EM & Thermal
Gist - Explosive

http://www.hb3.info/cosmos/caldari/cosmos_caldari.html
http://games.chruker.dk/eve_online/npc_ships.php