i found this cute little blog spot page that has an entry about logos and interesting thing about them and where they came from and how they were made and little clues in them.
this is a really cool website with different designs for logos with many different types on it and different ways to design things with different type.
Here is the wiki page that I found. The article talks about every thing there is to know about CBS. The person who created the CBS logo is around the bottom of the article.