Hard to say if this is real or not, but booksellers claim to have found a dictionary used and annotated by Shakespeare. They’ve digitized it and made it available on the internet (requires registration).
In simplest terms it goes as follows: with Baret’s Alvearie we are faced with a book that has not once been reprinted since 1580. A most obscure book. A humble copy. An extensive network of annotations that, through obscurity and a lack of attention, comes to light only now, never previously studied or speculated upon. These are the basic stepping-stones to providing plausibility to the dream that such a monumental discovery is possible. The rest is in the evidence.