I see that it is possible to display the Date Added column on the Toodledo Task list, but only by sorting Forward by Date Added. This is a bit kludgy imho.
I see someone asked way back in 2008 for Date Added to be an option as a display column for tasks -- I hope you are closing in on getting this added, as it would be nice! :)
Better yet, it would be very cool to have a task age column, showing the age in days of tasks. It's a frequent need of some users to consider very old and very young tasks, and although this is possible currently, it's frankly clunky.
Fancier still: allow group sorting of tasks by age, i.e. less than a week old, 1-2 weeks old, 3-4 weeks old, more than a month old, etc.
The goal of all this is to help people better flag those tasks which have been long outstanding, especially those who use the GTD model, where due dates for tasks are seldom if ever used.