挺管用的，配合搜索的筛选，可以很方便的删除诸如 Instapaper 导入的大量文件。
http://www.richardzhong.com/2012/03/%E5%A6%82%E4%BD%95_%E6%89%B9%E9%87%8F%E5%88%A0%E9%99%A4_personal_documents_amazon_kindle_%E4%BD%BF%E7%94%A8_%E6%8A%80%E5%B7%A7/
http://www.richardzhong.com/2012/03/%E5%A6%82%E4%BD%95_%E6%89%B9%E9%87%8F%E5%88%A0%E9%99%A4_personal_documents_amazon_kindle_%E4%BD%BF%E7%94%A8_%E6%8A%80%E5%B7%A7/
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