Ask HN: Need A WSYIWYG Editor for Web Development Frameworks

I have seen a lot of web frameworks that have made the development of web apps easy and fast. I especially like Django and Google's App Enginge, that tries to follow the MTV model very nicely. I being more of a back end programmer have a hard time designing the forms in HTML. Is there a framework/plugin that you can use to design the web layout.(like Cocoa Touch's Interface Builder)