I can't be arsed to search it this has already been posted. But I think it would be cool if there was a mob you could either befriend or, simply, kill. I think this would be easier if, on one map, there would be one or two of these human mobs spawned on each map. They would stay in one general area and wouldn't be that easy to find. To befriend them, you would give them food (brown mushrooms) and some resources. Now that you've befriended the mob, it would follow you around and help you survive, or go out by itself and gather resources for your base. If you choose to kill them, it would take a good amount of arrows to kill it. They would also have a bow and arrows and shoot them at you if you shot at them. If you killed the mob, you would get the arrows it had left and whatever resources it had.
lol
http://www.minecraftforum.net/viewtopic.php?id=5085