To be fair, as far as I can tell Jira's Scrum Board is pretty good (I only test drove it, though). It gets a lot of stuff right. It's main problem is that it'

To be fair, as far as I can tell Jira's Scrum Board is pretty good (I only test drove it, though). It gets a lot of stuff right. It's main problem is that it's connected to Jira. There appears to be a lot of baggage there. If I were to do this (and I've been tempted), I would make the UI pretty similar to Jira's and remove most of the complexity underneath. Of course the downside to this is that the complexity underneath is there for a reason: People who are not programmers want a whole bunch of weird stuff. However, I think there may be a small market for a programmer focused Scrum board that has basic reporting capabilities (which Trello, unfortunately lacks: Screenfull is quite good, but necessarily fiddly). Probably would fit into a 6 month project.