Double-pressing the phone's Home button brings up a Dock with recently used apps; users can switch between them without having to return to the Home screen. This should work for games, text editors, newsreaders, and just about anything else you can think of.

Folders is Apple's answer to App Store Fatigue--a growing epidemic caused by apps spreading across an almost untenable number of iPhone and iPod-touch Home screens. Instead of cutting back on purchasing or keeping apps installed, iOS 4 lets you group multiple apps into a folder, a single icon on the Home screen that, when tapped, expands to reveal the apps inside.

Dan Frakes has elsewhere on the site, but here's a quick overview of how it works. Simply drag one app onto another to create a folder--iOS 4 will even name the folder based on the first two apps you pair to create it (though you can customize the name if you want). You can organize folders in any way you see fit and you can even add them to the Dock. Since each folder can hold up to 12 apps, you can now have 240 apps on a single page, or a whopping 2,160 apps across all 11 supported Home screen pages.