Playing video games is for losers, apparently - these days all the cool kids watch other people play video games. Twitch, the platform of choice for your non-video game-playing needs, has updated its Android client with a few handy features in version 3.2. Both of them come straight out of YouTube's bag of tricks, but that's OK - every video player should let you do this stuff.
The first thing you'll notice is that Twitch now has a pop-out mini-player that lets you browse for a new stream while watching your current one. Press the channel button in the top left-hand corner of the fullsreen video to go back one step, where said video will minimize into a ribbon at the bottom of the screen. Tap the windowed video at any time to bring it back into the foreground.
Audio Only mode is probably a little more useful, but it's also harder to find. To disable the video stream and allow the audio to play with your phone's screen off or the Twitch app in the background, press the settings button, then tap the "Audio Only" option, then "Apply." Bingo! The audio will now play all over Android, with pause and resume controls in the notification drawer. You don't even have to pay a subscription.