Here we have Superfreakonomics, by Steven D. Levitt and Stephen J. Dubner.
This cover is quite cluttered, but I think it works well because the title of the book is very clear, being at the top of the page in a large, easy-to-read bold typeface. Even though there's a strange break between 'Freak' and 'onomics' I think it works because it breaks up a large, made-up word into two smaller and more easily-digestible chunks.
Moving on to the table of contents:
I love the use of white space in this layout and the clear delineation of each element. There are large margins on all sides, so nothing feels cluttered (despite the use of text boxes around the chapter numbers). It's very easy to find the chapter number, the chapter title, and the chapter description with only a brief scan and the hierarchy of headings is very clear.
This chapter headings use similar design elements, but less successfully.