The YouTube VR app allows you to easily find and watch 360° videos on YouTube. Some surround you (360°) while others look like a movie screen but allow you to turn your head and view your surroundings. Then of course there are movies, music videos and gaming. Below is a sampling of videos to start out with. I myself love checking out museums, virtual tours, history and educational in general. Watching a concert in VR is cool too. Don't forget movies and such can be watched with friends in the Oculus Lounge.
As I come across new cool items I will just add to this list. Be sure to bookmark and visit again. Have fun!