As per the Rules Compendium at p.14, beating a Listen DC by 20 allows you to pinpoint the 5' square that the sound is coming from, a very important function when facing stealthy or invisible ...
I'm remaking my Hunter in my home game for when we hit level 15. Paragon Multiclass Path, Druid. Human, took bonus at will power (Twin Strike), now swapping it out for the Druid power Grasping Tide. ...