I often joke (with myself since I'm sad that way) that everyone must at some point make a productivity web-app. It's nice that Joe has made one that fixes a few things that annoy me about most.
Most are targeted at engineers first (Pivotal), at visually oriented organizers (Trello) or adapted for the specific team that wrote it's methods (like Thoughtbot's).
Luckily I'm at the "tool choice" stage of a new venture so I won't give my team whiplash by trying this one out. If it integrates with Campfire it'd be perfect.