Hooray for the 21st century! The official Disneyland App is available for free in the Apple App Store and Google Play.
The App is a total lifesaver! It will allow you to: buy tickets and scan them from your phone, scan annual passes for entry from your phone (though you still need the actual pass for Fast Pass and AP discounts), book Fast Passes through MaxPass (click here to read all details about MaxPass), and view attraction wait times, character locations, restroom locations, closest dining locations (and book dining reservations), shopping locations, PhotoPass locations, entertainment schedules. See below for a few photos of the app.
ATTRACTION WAIT TIMES: