[mth-]

Totally agree. I have used index cards as a planning tool and a to do list for a long time. Trello, in all its nothingness, is the only thing that has come close to the efficiency of a pencil and stack of cards.

[eckyptang]

Agreed. I have used the same method since about 1985 and it works wonderfully. The only optimisation has been change to a mechanical pencil.

I've lost my card stack a couple of times in those years and there has been no negative effect.

I've played with and written various bits of software but it just doesn't make it any better either.

This problem is solved already.