A bookseller wanted to spice the celebration, and as Miguel de Cervantes and William Shakespeare died on this same day, he promoted the giving of books as a present. Since then, men give roses and women give books (although the mutual exchange of books is customary now).
I gave my girlfriend an origami rose (the diagrams are from here, based on a version of Kawasaki's Rose found in Origami for the Connoisseur, Amazon link) and she gave me an amigurumi dragon. We are strange.
9 programming books I have read and somewhat liked...
Book review: How to be #1, by Vince Lombardi