classification & display options in Magento - tags, categories, etc

[TMDwayne]

In a Magento Shop, I would like to be able to classify products by some Classification mechanism (example: Tag, Category, Related products or somthing else?) Then I could build a block that will show all classification titles. User can then click and get a page of all products in this classification.Example:\[code\]HondaToyotaChevroletHyundaiChrysler\[/code\]We already use Categories, so using this classification mechanism would generate a list with many unwanted entries. I was thinking usingthe tag system, but I have not found any references on the web that discusses using tags in this way. Maybe performnace is not good?This is how I get category list.\[code\] $categories = Mage::getModel('catalog/category')->getCollection() ->addAttributeToSelect('name') ->addAttributeToSelect('url_key') ->addAttributeToSelect('my_attribute') ->setLoadProductCount(true) ->addAttributeToFilter('is_active',array('eq'=>true)) ->load();\[/code\]Anyone have any code samples for listing tags, or a better way to do this?