I just headed over to DabbleDB's site to check it out and I see that Twitter, of all companies, has acquired it (!) They're no longer accepting new sign-ups. It looked like a totally awesome service. I can't imagine how twitter is going to use this.
The same team also run another analytics app called Trendly. And the team will be joining the analytics team on twitter. So you can see where it's going :)
dabbledb was a great service. I think it was still a little more technical/large dataset feeling though. It's not accepting new signups or accounts now :(. Twitter bought them more for trendly and the team.
Isn't that the kind of thing the OP is asking for?