Sending Google Maps directions to an Android phone hasn't been that hard for a while, but it's now downright easy. Google has introduced a web feature that delivers instructions through a simple search. As long as your phone is properly linked to your Google account, you only have to search for "send directions" to get the ball rolling -- choose the route, hit send and your device will be ready to navigate. Only some people appear to have access to this option as of this writing, but there's a good chance that you'll get to check it out before too long.
Update: Google is also giving you the option of sending notes to your phone just by searching for "send a note."