Is absolutely missing the possibility to find the tasks completed gathered in a category called "done" (or something similar) - in both the RTM "tasks" page and Gmail's right-hand side column (under "today", "anytime" etc.).

The dynamic being to have tasks automatically transferred to such category once they are checked "completed" and to allow there a selection of what to keep or delete.

Such would give RTM the ability to act as a checklist along its present sole function of "reminder". Something which I don't think would be too complex to integrate and would certainly give a fuller sense to this program.

It is often times equally important to be reminded of what to do as to recall/remember what has already been done.

That is what I am presently - urgently - looking for and if RTM could fulfill such task, given all the more it's Gmail integration, it would be simply terrific.