一个比较简单的插件，用来学习的话觉得不错。主要功能是在产品分类列表页面中增加可以删除Placeholder的方法。插件 - Remove Placeholder。

Magento Connect:magento-community/ESolutions_NoPlaceholder

介绍：

Provides a method that can be used to remove the placeholder on the category list page.

This module extends Mage_Catalog_Helper_Image and provides the method hasImage() which will return true if the current product has an image and false if not.

This new method can be used in an if statement to remove the magento placeholder image.