Android 5.0 Lollipop is here at last. You’ll get it automatically if you buy a Nexus 6 or Nexus 9, and it's also now available on a range of other devices. Android 5.1 is also now starting to roll out, too.
20 Hidden Android Lollipop Tips and Tricks at Lifehacker
20 Hidden Android Lollipop Tips and Tricks at Lifehacker