Title Case

Who invented Title Case?

Last week I saw the website of Designers & Books, a very nice initiative. But in the [[http://www.designersandbooks.com/books/author/genre/all/list|list of books]] I was very much distracted by the use of Title Case in the book titles.

Most text editing software nowadays has the possibility to change a sentence into Title Case (or lowercase, UPPERCASE, Sentence case and maybe even CamelCase). Personally I think the use of Title Case makes the book titles swollen-headed.

Where does this practice of Title Case come from? Is it an American custom? Who invented Title Case? And who can tell me the pros of using it?