A nuclear weapon. When built right and sign anywhere on side When set 0ff the bomb will fly over to the coordinates and when it hits something it will blow up. When shot by arrow it will blow up. Sign with coordinates.
this seems like a cool idea, ill try it but it will take a while... and for the movement, thats not possible with the bukkit API so ill just teleport the tnt to the location
You could use the movecraft api, it will move the blocks asynchronously for you. Might be a bit heavy for single blocks though.