look at Flickr's sets and tags: each image can only exist in one set. Because of the free-form nature of categories, they are closer to tags.
Actually, in Flickr, an image can exist in as many sets as you want, just as you can put a WP post in as many categories as you want. The difference between the free-form categories and tags is that tags don't have parent objects. In WP, if you put a post in a sub category, it will be displayed in the parent as well.
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Dan Coulter
http://www.dancoulter.com/
http://www.phpflickr.com/
Hey, I got nothing to do today but smile
-Simon and Garfunkel
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