Nails are used for some quests, and expanding instanced building zones.
Nails
Beeps Cydira Difterboy Disturbedgurl Draco7991 Hidden6018 InTaco Ismyl Japanium Jiaowei LotsOfSitting Lycanclaw Ningo Skejonte Spindlethumb SuicidePenguin Surrus Weirdguy