http://bukkit.fr/index.php?threads/9820/

Beams.java

package fr.neatmonster.beams;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.entity.Creeper;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

public class Beams extends JavaPlugin implements Listener {
    public class Beam implements Runnable {
        private final Creeper base;

        public Beam(final Location location) {
            base = (Creeper) location.getWorld().spawnEntity(location, EntityType.CREEPER);
            base.addPotionEffect(new PotionEffect(PotionEffectType.INVISIBILITY, Integer.MAX_VALUE, 15));
            base.setPowered(true);
            Creeper vehicle = base;
            for (int i = 0; i < 10; i++) {
                final Creeper passenger = (Creeper) location.getWorld().spawnEntity(location, EntityType.CREEPER);
                passenger.addPotionEffect(new PotionEffect(PotionEffectType.INVISIBILITY, Integer.MAX_VALUE, 15));
                vehicle.setPassenger(passenger);
                passenger.setPowered(true);
                vehicle = passenger;
            }
        }

        @Override
        public void run() {
            Creeper vehicle = base;
            vehicle.remove();
            while (vehicle.getPassenger() != null) {
                vehicle = (Creeper) vehicle.getPassenger();
                vehicle.remove();
            }
        }
    }

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void onPlayerInteract(final PlayerInteractEvent event) {
        final Player player = event.getPlayer();
        if (player.getItemInHand().getType() == Material.STICK) {
            Block target = null;
            if (event.getAction() == Action.RIGHT_CLICK_AIR)
                target = player.getTargetBlock(null, 200);
            else if (event.getAction() == Action.RIGHT_CLICK_BLOCK)
                target = event.getClickedBlock();
            if (target != null)
                Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Beam(target.getLocation()), 20L);
        }
    }
}

plugin.yml

name: Beams
version: 1.0
author: NeatMonster
main: fr.neatmonster.beams.Beams