Convenience method to see if a material is a block

src/main/java/org/bukkit/Material.java

@@ -193,6 +193,10 @@ public enum Material {
         return id;
     }
 
+    public boolean isBlock() {
+        return id < 256; 
+    }
+    
     public static Material getMaterial(final int id) {
         return lookup.get(id);
     }