The latest DLC for Borderlands, The Secret Army of General Knoxx, is going to be available for purchase this week.  Xbox 360 owners will have access to it for 800 MS Points starting tomorrow.  If you have it on PC or PS3, you will only have to wait until Thursday to get your hands on it for $9.99.  Along with some new areas and enemies, the DLC will also give you some new loot to get your hands on and it will raise the level cap.