Hiring/collaboration opportunity for you guys to consider.
I have at least heard of if not tried every productivity app under the sun.
Or so I thought.
Today I came across these guys, only to find out that they are shutting down the service due to lack of interest.
Their site says no new users but signup is not yet disabled, so if you click sign in then "new account" or "sign up" or whatever, you can still demo this excellent presentation.
I particularly like the quick-add areas and task-star and tag cloud management approach displayed on the right.
It seems a shame as there maybe some overlap in feature interest among your users and their fault seems to be lack of marketing know-how, not necessarily technical or user-interface know-how.
Perhaps there is an opportunity to work together as Todoist moves forward?
http://www.hoverhq.com (Hover Tasks)