Having used Dabble regularly for work, I'll note that there's still a lot of room for competitors there. It's had some serious performance problems in the past few months, to the point that I've seen people go out of their way to avoid opening it even when it's got data they want. I think there's also room for usability improvements, but I don't know if I have the ideas to back that up.
All that said, it's still a fantastic tool, and Seaside is an amazing framework.
All that said, it's still a fantastic tool, and Seaside is an amazing framework.