It doesn’t matter whether Amazon’s Kindle has 60 percent market share, or that Sony has its powerful brand backing its Reader. Barnes & Noble wants in on the nascent e-reader market. For reasons not apparent at press time, Barnes & Noble is calling its new electronic reading device the Nook, officially launching it during a late-afternoon Eastern time press event Tuesday in New York City. A Wednesday conference call was scheduled for media, but plenty of Nook information had already leaked out before the Tuesday afternoon event.