As already mentioned, Swarmfighting screams goblins, and it goes well with Phalanx Fighting (also in Complete Warrior)
Swarm'll get a Dex 16 goblin up to +3 to hit,
Phalanx'll get 3 goblins +3 AC and +1 to Reflex Saves.
Putting them together probably won't be feasible for a few more levels unless you're planning a very hard encounter... Goblins would have to be CR 2's (npc class level 3) each for the feat combo, and a base of 10+3dex+3phalanx+2shield+2armor... 20 AC assuming minimal armor is a bit much for a level 3 group.... without sleep that is.