First, fantastic job on this project - especially in it's early stage!
I know this request is probably something far down the road, but would it be on the roadmap at all to allow users on a site to use a sweaver UI to theme certain pages? For example, allow users to theme their profile page (based on selectors you allow), content types, etc. Behance.net has something where you can pick the background colors, border, font, padding, etc of content types using a UI similar to sweaver. I know it's very early on, but would this be a possibility?
Keep up the great work! Can't wait to see where this goes. :)