The good'ol "organize your stuff" problem. The problem with "categories" is that a) usually a "thing" can only belong to 1 category and b) a category often belong in a hiarchy of categories and can only be 1 place. So that is why I've used _tags_ instead, which is more of a many to many "flat" releation. Not sure I understood your comment correctly? ..I've certainly given this quite some thought already, but nothing is perfect