If you can't customize columns, you've already lost :) But I really like the way you explicitly mention Kanban and Scrum, which Trello doesn't mention at all.
Thanks! Well customising columns is the obvious next step and is on the top of the list, so that won't be far away.
To be fair they also have comments and todo lists per card, like Pivotal, so Wallboardr is a bit behind at the moment. I've been wondering how essential sub-card todo lists are for a while, I've found myself wanting them, but MVP ideals have avoided so far.
