The lead piece looks at the odds of Len Riggio taking Barnes & Noble private now that the board is looking at a possible sale of the company. Harper CEO Brian Murray talks about the publisher's rebound in fiscal 2010, while Copia execs explain how their forthcoming e-reader, social network platform will work. Craig Teicher reviews four recently released enhanced e-books. In retail, our feature looks at the rise of used books. And our main feature examines trends in cookbook publishing.