Mass Effect 2 Add Ons

XBOX

Mass Effect 2 Arrival DLC Trailer

explains the DLC

Lair of the Shadow Broker

helps bond with an old teammate again

Firepower Pack

gives you a couple of extra weapons

Aegis Pack

gives you extra armor 

Overlord

fight Geth

PLAYSTATION

Terminus Pack 

gives you armor and an extra gun 

Firepower Pack

gives you extra weapons 

Recon Operations Pack

gives you armor, weaponry, and helmuts

Equalizer Pack

gives you armor and helmuts

Cerberus Pack

lethal gun for hire, bonus armor and weapons

Arrival

helps with Mass Effect 3