Scenehunt - Search, share and explore Film and TV shooting locations
Sketch Talk - A community for Sketch users of all skill levels
yapQ - Turn your smartphone into an audio tour guide
SketchCasts - A weekly screencast, all about how to use Sketch
Tramble - The codebreaking walking challenge. UK only
Sketch 101 by Designlab - Learn Sketch in this free course w/ downloadable templates