How better to celebrate your billionth download than with a brand new app store? RIM just rolled out App World 3.0 beta to its Beta Zone users, bringing with it a redesigned home screen created to "let you quickly find what BlackBerry app, game or theme you're looking for." Seems a bit overdue if you ask us, but better late than never, as the idiom goes. There are also new home screen icons for Games and BlackBerry Themes -- the store's two most popular categories. (Yes, Themes really is one of the two most popular categories... behind Games, we hope.) You can also flick between app summaries, screenshots, and reviews from one screen, and share links to your favorite apps over Twitter, Facebook, email, SMS, and BBM. You may find it difficult to get too excited about an app store update, but for those of us who use BlackBerrys despite the occasionally less-than-stellar app experience, anything RIM can do to streamline the procurement process is more than welcome.