iOS 101: How to Use Multitasking on Your iPhone or iPad
Since iOS 4.0, the iPhone's been able to allow multitasking -- the ability to run more than one application at a time. Even though the feature's been there, that doesn't mean every user knows how to take advantage of it. Here's a quick primer.
http://feedproxy.google.com/~r/TheAppleBlog/~3/GKUpc9ZJUCw/