Mass Product Actions

or search frequently asked questions:

Can I change prices per website?
How to change attribute set in Magento?
We have an extensive number of products in our store. Will the extension handle this?
Can I clear all related products from items in bulk?
Can I assign, remove or replace a website for a number of products in bulk?
How can I update meta title/descriptions in bulk using this extension?
Will updating attributes of a configurable product delete simple products associated with it?
Can I add a product to more than one category at a time?
Is there a Multi Way option for relating products in bulk?