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In Covey's model, "urgent" means that a task requires immediate attention. For example, a ringing phone, catching a flight or preparing for a meeting tomorrow. They are the the items in our to-do list that shout “Now!”. The main problem with these tasks is that they usually put us in a reactive mode, one marked by a defensive, negative, hurried, and ...
From your requirements above, it would seem that Trello may be a good solution to your preferred organization system. A single Trello 'board' contains a system of 'lists' which can contain unlimited 'cards'. Each card can contain a variety of content including tags, links, files, etc. And Trello can very easily be setup for GTD use.
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