I recently ran into EyeQuant a neat tool to visualize how cluttered a website is. Here is an example of the attention map with my own blog:
Attention Map
In addition to attention maps you can visualize how you scale in terms of clarity.
Visual Clarity
I had previously seen a post (somewhere) that detailed how the same analysis could be applied to resumes and other important documents. It is a little sad to see how even after this concept has been drilled into most of our minds, cluttered design and ad-ridden websites are so prevalent.
Abe Diaz 