It’s been a while since we were using Thoughtworks Mingle as our agile project management tool. We liked their Kanban style Card Walls View a lot.
Nevertheless, we switched to PivotalTracker because of its superior support of prioritizing stories in a backlog and automated iteration planning. Unfortunately, PivotalTracker does not offer any Kanban style card wall view. Interestingly enough, Mingle has now caught up and is offering the possibility to “Prioritize and rearrange by drag-n-drop to reflect the actual order of execution of your stories“.