This contribution is pretty much a updated version of the old Products Multi v1.0 contribution.
I've updated this contribution to work well with osCommerce 2.2 Milestone 2. For those who used the old contribution you probably noticed the product listing page did not make use of paging and dynamic columns. This contribution looks to fix that by using the new product_listing.php page.
WARNING: This is the first release. It's a simple modification but bugs may still exist. The contribution won't ruin your store, because you can always go back to the old product_listing.php file, but please test it first and let me know if bugs do exist