edit: I was thinking of checklists, not cards.
edit: I was thinking of checklists, not cards.
It's not a project management tool anymore than it is a bug tracker or a crm or an applicant tracking system. People use Trello for all of those things but at its core, it is just a list of lists.
The power comes from understanding how that metaphor can help provide structure to some process that you have. (Trello comes from "trellis" - a structure to help plants grow).
Check out trello.com/inspiration for some examples. It's a bit like explaining to someone what a spreadsheet is before they have seen one and why they would use one. Once you grok it, it's very powerful.
I think of Trello these days like an orchard of ideas. I plant a few idea seeds by rapidly sketching out cards, and some will grow checklists as I copy paste bullets from notes etc. As the checklist items grow in complexity, they fall off the tree and are planted, and so on..
If you're a PMP used to Gantt charts and such, I'm sure that system sounds like some hippy dippy BS, but it works very well on a small scale with a small, mixed-discipline team.
You can do both.
http://help.trello.com/article/942-assigning-people-and-due-...
Still, I don't think I want to use Trello on my projects (I use it in some projects for customers). I can't articulate well the reasons but the general feeling is that if the project is not trivial you start having too many cards and the columns get too long and you start losing stuff. It's not for long living projects, where you need to store information that let you tell who decided what and why two years ago. It's better suited for short bursts of activity and to dispatch tasks to executors. Probably one project manager to assign tasks and developers to report on their accomplishment. It could be a good tool for that.
As an example of what it shouldn't be used for: bug tracking. We are creating cards for bugs on a project but Trello cards are not well suited for that, neither to input bug reports nor for managing them. To be fair, I bet that Trello didn't design for this use case. That someone is using it for this maybe means that it's appreciated beyond its limits.