"This extension has been reviewed on http://www.magekarma.com/ - see the review here: http://www.magekarma.com/magento-extension-review/proxiblue_dyncatprod/
"By using this module you will avoid to manually assign products to categories whose content can be dynamically determined by a combination of rules. Considering the time it lets you save it is definitively worth its price.""
OpenMage Dynamic Category Products
