Sony Formally Announces World's Lightest 6" eReader + Dedicated "Public Library" Wireless + Harry Potter eReader & Free E-Book Promo A lot of news from Sony all in one product announcement about a product the gadget crowd has been talking about since a recent leak. Here we go with the details. 1. Release of World’s Lightest 6″ Touch Screen eReader The new Reader Wi-Fi (PRS-T1) builds on the popula