Well, the design is very nice, but I'm not sure what I'd use it for - it's a difficult middle-ground between document sharing and full project collaboration. I do, however, really enjoy the "comment on everything" feature.<p>Maybe you could elaborate more on your use case of writing a blog post: Does your app output formatted html that you paste into your blog editor? Do the entries become published pages?<p>Do you use a UI framework, or are the screenshots just mockups? Either way, they're quite nice!