How can I play YouTube in the background without using Safari? [duplicate]

Is there an easy way to keep playing YouTube videos in the background, even if I switch to a different app?

I'm not interested in using the Safari multitasking trick. I want something super easy to use.

On iOS 5.1 (not sure for earlier versions) the same procedure works for the YouTube app too (as for Safari):

• Start the video in the YouTube app.
• Press "Home" button once to go to springboard (or twice to switch to another app)
• Press "Home" button twice to bring up the app-switcher. Slide to the right to bring up background audio controls. The icon on the right side will show whichever program you last used with background audio: YouTube.
• Press Play. YouTube audio will resume playback.