Thanks for the push in the right direction. It took me a few minutes, but I figured it out. Now it will identify any EntityMob within 5 blocks (if my understanding of the +5 is correct)
For those who actually would like to see some code:
List e = player.worldObj.getEntitiesWithinAABB(EntityMob.class, AxisAlignedBB.getBoundingBox(player.posX, player.posY, player.posZ, (player.posX + 5),(player.posY + 5),(player.posZ + 5)));
if (e.size() > 0) {
for (int i = 0; i <= e.size() - 1; i++) {
EntityMob em = (EntityMob) e.get(i);
LogHelper.info(em.getEntityName());
}
}