With the bulk of our correspondences now taking place digitally, it's no wonder letter openers have been relegated to the luxury gift category. But the humble object remains one of those iconic pieces of design; Enzo Mari designed a whole series of them for the Italian company Danese in the '60s. Now comes the advent of the carbon fiber letter opener. Designed by the Austrian studio Purisme, this ergonomic opener is both an office accessory and a weapon for self-defense. It also won the Red Dot Product Design Award, 2008.