It should also be effortless to add a new task or check what is left to do: if it requires even a little of your energy or time, you'll end up not doing and the dreared whoosh will come again.

One of my favorites is the Google calendar gadget: by clicking on the calendar icon, I can check out my schedule for the next few days and even add events.

You can add a mesh Collider to your already existing graphical meshes (even better use the Import Settings Generate Colliders check box), or you can use one of the other Collider types.