I have grown to love Trello. Despite some frustrations (let me export easily, grrr!) it is a great tool and we have our development roadmap laid out in quite some detail in it. But ours is private - just the business and development team can see it - and I'm not ready to take the leap of faith to make it public. I fear a number of things - promising features we can't deliver or unrealistic time scales, having to explain things in greater detail, making our conversations less honest / airing our dirty laundry, showing everything to our competitors etc. Most of them I can get my head round, but making the roadmap fully publice feels like opening Pandora's Box - once you go that route, there's no going back - and I'm not quite confident yet.