iLounge, which is one of the best sites for learning about accessories, has today released their free iPad 2 Buyers' Guide, a 146-page downloadable book in pdf format. It includes articles about the various iPad models and such things as how to download and use iBooks, using the cameras and camera apps, and iTunes media syncing. The heart of the book is the Accessories Buyers' Guide, a massive look at iPad 2 add-ons.