I just found a site that is meant to help in the creation of clear, concise, visual advertising. I think it can also be applied to the elements of our web pages.
The author offers help in making visual elements stand out and cause logical thinking with minimal conscious effort by the reader. I especially like how the examples show slight change in content leading to calls to action that are easily identified and answer the questions in the reader’s mind.
Check it out at: http://www.visualmess.com/