Mock Me A Website

Here's an idea for a product if anyone would care to make it. I'm frequently tasked with creating a new web based product. The problem is that using even a WYSIWYG editor is too slow for what I want when we're having brainstorming or general design sessions. What I need is a program that I could fire up and very quickly lay out the general flow and page design. Here's my wishlist:

1. I can zoom out to see the overall map of the site


2. I can zoom into a page and see the rough design of the page


3. I can draw a component on the page

I can make notes on the page

4. I can link a component to go to another page


5. From the zoomed out view I can move pages around


6. From the zoomed out view I can see the links between pages


7. I can edit the source of the HTML and when I preview the page the sketched page can be an overlay on top of the page so I can compare the "real" page with the "sketched" page

If this already exists then tell me where. I'd love to spend time and create this, but I know better then to think I can make the time for something like this.