Book Titles
A good, catchy title always makes me want to pick up a book.
I've seen this kind of information in various writing/publishing books, though I'm not sure which ones at this point. It might have been "The Everything" (get published) series or a 1990's book about "What the publishing industry won't tell you, and as someone mentioned, I think WD had an article on this topic.
Anyway, when I published my history-related book, I was told to keep the title "short," that even 5 words was too much, but that was probably for that publisher/genre, since we all know there are longer titles out there.