Added minecart classes and World.spawn*Minecart(). Minecart.getPassenger() is still a stub that needs to be implemented (due to of a need of a MC entity -> CraftBukkit entity lookup) and StorageMinecart.getInventory() is waiting on the implementation of inventory.

src/main/java/org/bukkit/craftbukkit/CraftMinecart.java

@@ -0,0 +1,69 @@
+package org.bukkit.craftbukkit;
+
+import net.minecraft.server.EntityMinecart;
+import org.bukkit.LivingEntity;
+import org.bukkit.Minecart;
+import org.bukkit.Vector;
+
+/**
+ * A minecart.
+ * 
+ * @author sk89q
+ */
+public class CraftMinecart extends CraftVehicle implements Minecart {
+    /**
+     * Stores the minecart type ID, which is used by Minecraft to differentiate
+     * minecart types. Here we use subclasses.
+     */
+    public enum Type {
+        Minecart(0),
+        StorageMinecart(1),
+        PoweredMinecart(2);
+        
+        private final int id;
+        
+        private Type(int id) {
+            this.id = id;
+        }
+        
+        public int getID() {
+            return id;
+        }
+    }
+    
+    protected EntityMinecart minecart;
+
+    public CraftMinecart(CraftServer server, EntityMinecart entity) {
+        super(server, entity);
+        minecart = entity;
+    }
+
+    @Override
+    public Vector getVelocity() {
+        return new Vector(minecart.s, minecart.t, minecart.u);
+    }
+
+    public void setVelocity(Vector vel) {
+        minecart.s = vel.getX();
+        minecart.t = vel.getY();
+        minecart.u = vel.getZ();
+    }
+
+    public LivingEntity getPassenger() {
+        // @TODO: Implement
+        return null;
+    }
+
+    public boolean isEmpty() {
+        return minecart.j == null;
+    }
+
+    public void setDamage(int damage) {
+        minecart.a = damage;
+    }
+
+    public int getDamage() {
+        return minecart.a;
+    }
+
+}

src/main/java/org/bukkit/craftbukkit/CraftPoweredMinecart.java

@@ -0,0 +1,17 @@
+package org.bukkit.craftbukkit;
+
+import net.minecraft.server.EntityMinecart;
+import org.bukkit.PoweredMinecart;
+
+/**
+ * A powered minecart.
+ * 
+ * @author sk89q
+ */
+public class CraftPoweredMinecart extends CraftMinecart
+        implements PoweredMinecart {
+    public CraftPoweredMinecart(CraftServer server, EntityMinecart entity) {
+        super(server, entity);
+    }
+
+}

src/main/java/org/bukkit/craftbukkit/CraftStorageMinecart.java

@@ -0,0 +1,17 @@
+package org.bukkit.craftbukkit;
+
+import net.minecraft.server.EntityMinecart;
+import org.bukkit.StorageMinecart;
+
+/**
+ * A storage minecart.
+ * 
+ * @author sk89q
+ */
+public class CraftStorageMinecart extends CraftMinecart
+        implements StorageMinecart {
+    public CraftStorageMinecart(CraftServer server, EntityMinecart entity) {
+        super(server, entity);
+    }
+
+}

src/main/java/org/bukkit/craftbukkit/CraftVehicle.java

@@ -0,0 +1,16 @@
+package org.bukkit.craftbukkit;
+
+import net.minecraft.server.Entity;
+
+import org.bukkit.Vehicle;
+
+/**
+ * A vehicle.
+ * 
+ * @author sk89q
+ */
+public abstract class CraftVehicle extends CraftEntity implements Vehicle {
+    public CraftVehicle(CraftServer server, Entity entity) {
+        super(server, entity);
+    }
+}

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -3,15 +3,19 @@ package org.bukkit.craftbukkit;
 
 import java.util.HashMap;
 import java.util.Map;
+
+import net.minecraft.server.EntityMinecart;
 import java.util.Random;
 import net.minecraft.server.WorldGenBigTree;
-import net.minecraft.server.WorldGenTrees;
 import net.minecraft.server.WorldServer;
 import net.minecraft.server.EntityArrow;
 import org.bukkit.Arrow;
 import org.bukkit.Block;
 import org.bukkit.Chunk;
 import org.bukkit.Location;
+import org.bukkit.Minecart;
+import org.bukkit.PoweredMinecart;
+import org.bukkit.StorageMinecart;
 import org.bukkit.Vector;
 import org.bukkit.World;
 
@@ -88,6 +92,33 @@ public class CraftWorld implements World {
         return new CraftArrow(world.getServer(), arrow);
     }
     
+    public Minecart spawnMinecart(Location loc) {
+        EntityMinecart minecart = new EntityMinecart(
+                world,
+                loc.getX(), loc.getY(), loc.getZ(),
+                CraftMinecart.Type.Minecart.getID());
+        world.a(minecart);
+        return new CraftMinecart(world.getServer(), minecart);
+    }
+    
+    public StorageMinecart spawnStorageMinecart(Location loc) {
+        EntityMinecart minecart = new EntityMinecart(
+                world,
+                loc.getX(), loc.getY(), loc.getZ(),
+                CraftMinecart.Type.StorageMinecart.getID());
+        world.a(minecart);
+        return new CraftStorageMinecart(world.getServer(), minecart);
+    }
+    
+    public PoweredMinecart spawnPoweredMinecart(Location loc) {
+        EntityMinecart minecart = new EntityMinecart(
+                world,
+                loc.getX(), loc.getY(), loc.getZ(),
+                CraftMinecart.Type.PoweredMinecart.getID());
+        world.a(minecart);
+        return new CraftPoweredMinecart(world.getServer(), minecart);
+    }
+    
     public boolean generateTree(Location loc) {
         WorldGenTrees treeGen = new WorldGenTrees();
         return treeGen.a(world, rand,