I just use a Trello board for my personal todo lists, it's simple and I know it won't be going away anytime soon. You can add attachments, due dates and all sor

I just use a Trello board for my personal todo lists, it's simple and I know it won't be going away anytime soon. You can add attachments, due dates and all sorts of nice little things in a card. I use it to manage projects with collaborators too so everything is in one place which is nice for me.