While Apple rolled out the iBookstore alongside the original iPad in 2010, providing a home for books, in 2011 the company has been focused on periodicals. Apple's surfaced in February with , and in iOS 5, Apple is putting periodicals front and center with Newsstand.

On your iOS device, Newsstand is basically a special folder where the latest versions of periodicals to which you've subscribed will appear--automatically, downloaded in the background--when they're released.

And if you want to add newspapers or magazines to your collection, you can just tap the Store icon in Newsstand to be taken to a special section of the App Store that caters to just that type of content.

The iPhone and Twitter gained popularity around the same time, so it's little surprise that they often seem so intertwined. That special relationship is even stronger in iOS 5, thanks to system-level Twitter integration. Now you can enter your login information once and have the ability to tweet photos, links, or locations, right from various iOS apps, including Safari, YouTube, Photos, Camera, and Maps.