Agreed. I kind of don't get Trello. Always thought of it as kind of a lightweight "stack of cards" analogue best used for simple high-level planning along the lines of a Kanban board. Is that how people use it?

We used it recently as a kanbanish/scrumish board for a recent development cycle and it worked out pretty well. We had separate boards for each sprint, and a backlog board that contained some broad-swipe categories. It would definitely be nice if it had better integrations with fogbugz (which our team also uses) or other bug tracking platforms, but I imagine it would be challenging to do that and maintain its extreme ease of use/simplicity.