reading publications about personal information management and personal organisation for many years now, I always found the so called ""Covey Quadrant":http://c2.com/cgi/wiki?FourQuadrants" more than useful.
But I have seen it integrated into software rarely although it shouldn't be too complex (or complicated).
I am wondering if there is some more interest to have a look if that could be realized with tracks. As I am not a ruby person I just could express from the point of user: providing a possibility to set either an "urgency" and an "importance" value within the todo entry dialog and either order by a calculation of both values or provide a view, where both are recognized.

A graphical view, like at "still cool ancient] and [http://www.brandnewbox.co.uk/lab/fridge.html very rough newer":http://www.doc.ic.ac.uk/~np2/software/todo.html examples would be nice but probably too far away from this projects' targets...