GeForce Experience has been a pretty nice little tool for me to record and broadcast my gameplay. An upcoming update will make it even more powerful.
First up, there will now be an overlay in the game so you can access the Shadowplay features a lot easier. You'll be able to upload your gameplay straight from the overlay and continue playing without having to exit the game.
The more exciting feature is like Sony's Play Share where you can invite a friend in to take control of your game if you're stuck on something. You can also invite the person in and play along side you on games that allow for two players to play at once. Pretty slick. Check out the video below to see it all in action.
The update with these features should be out sometime in September.