Ah sorry mate. The Anti-Lift Kit (ALK) is basically a set of bushes, different designs for different cars, that work to give you more (0.5 degrees in most cases) positive caster, i.e. the tilting the strut towards the front of the car. It came about as a response to WRX power-understeer and has a direct effect on dynamic camber (how much the wheel tilts) when turning a corner. Without getting all James May on you and explaining suspension physics it's a good thing. Subaru actually made a mod to the STi Imprezas based on this product.
Basic Caster Explanation
Basic Camber Explanation
It is Wikipedia so written by wannabe professors but it gives you the basic idea