I think this is a great idea. First impression, I would reconsider the colors. I think there's something to be said for being playful, however I'd like to see colors that are a bit more businesslike. The colors say toy, but this is a tool.
Granted, web 2.0 has proven that a pastel color scheme can work, and I do think it can work for you too but you either need to pull back on it or take it a step further and support it with some more stylized design elements.
Specifically, if your site name in the header felt more like a logo and felt a bit playful, you'd be signaling that this lightweight, airy feel is part of your brand identity.
Right now there's some disconnect there.
The dark blue you are using is nice, I think maybe just making that a bit more prevalent in your design would serve to ground the overall design a bit more.
Granted, web 2.0 has proven that a pastel color scheme can work, and I do think it can work for you too but you either need to pull back on it or take it a step further and support it with some more stylized design elements.
Specifically, if your site name in the header felt more like a logo and felt a bit playful, you'd be signaling that this lightweight, airy feel is part of your brand identity. Right now there's some disconnect there.
The dark blue you are using is nice, I think maybe just making that a bit more prevalent in your design would serve to ground the overall design a bit more.