As you have probably noticed, most book stores tend to stock most of their books in a "spine out" manner, with only the best sellers and heavily promoted titles being shown front on. This is of course perfectly logical and allows them to fit in more of the lesser known/demanded titles, while displaying the big sellers in the best possible way.
The Wall Street Journal recently published an article about the worldwide bookstore chain "Borders" who have recently launched a new merchandising initiative that has seen more of the books be exposed "front out", with a reduction in the overall number of titles available on the shelves by between 5-10%. Although reduction of titles may appear bad it is not all that illogical considering some books will only be purchased once or twice a year.
Over the trial period of this new merchandising strategy sales rose by 9%, and as a result Borders are planning continuing this strategy in order to further increase sales levels. Borders undertook marketing research in the trial stores, and interestingly enough consumers believed that there were in fact MORE books in the store under the new configuration... Looks like they are onto a winner!