How to notify some users when an attribute change in Magento?

I need to notify on group of user when a product is edi开发者_开发百科ted and saved and one given attribute has been changed.

Let's say I've an attribute is_new sets to false, if an admin update the product, I need to hook that this attribute has been changed and notify via emails the group "subscribers".

Any ideas?

You can do this with events, there's some basic information on how to create events in the magento wiki:

http://www.magentocommerce.com/wiki/5_-_modules_and_development/0_-_module_development_in_magento/customizing_magento_using_event-observer_method

The event you need is probably catalog_product_save_before or catalog_product_save_after, depending on how you setup the code.