Android: A while back, Google added the ability to type "send directions" into Google to automatically forward directions to your phone. Then it added the much more useful ability to send directions from Google Maps to your iPhone. Now, the latter feature finally works for Android phones as well.
As long as you have the latest version of Google Maps installed on your Android device, when you look up an addresses with Google on the desktop, you will get a link offering to "Send to device." Tap the notification on your phone and you'll be able to start navigating, or just read information about the place you're looking up.