Looks great, and kudos on releasing open source code as well. As a developer who has specialized in making web-based maps, I've been dreaming of something like this coming a long, and here it is.

I had seriously considered working toward the same goal, but gave up because I wasn't sure about what kind of customers I might find. I'm still convinced that there are a lot of customers out there for this type of thing, and I hope you guys make this into something big!