Magento module Keep Products Urls
Very important tool for every Magento owner! This module will keep Your category based urls safe when You will change product categories.
When You are changing product categories all urls with category path like "http://demo.dev-magento.eu/electronics/cell-phones/nokia-2610-phone.html" are lost! Use this module to prevent it. This module will create custom url rewrite so all old links will work as always