Trello is great, the interface makes me a lot happier than Pivotal, but I think it's more suited for something like a big data collection and processing project, where you have a lot of little pieces to keep track of. It doesn't seem like it would be that great for software development. Correct me if I'm wrong though, please.

BTW I thought I read someone comment somewhere about being able to split checkboxes out into separate cards, but I couldn't find any other mention of it. Can you do that? That's one thing that I thought would make Pivotal much better.

One of the nice things about Pivotal Tracker was that it was opinionated in just the right ways.

That being said, I like Trello as well. I will not be surprised if Trello provides an imported for Pivotal Tracker because of the uncertainty of this news.