The NXT 2.0 kit comes with parts to make a ball shooter ("Zamor Sphere Launcher"), but it is not exactly obvious how to build a simple one that is controlled by the NXT, and the shooter on the built-in ShooterBot robot is somewhat strange and hard to transfer to another robot. So I have posted a design for a compact and sturdy Ball Shooter that is easy to attach to another robot:
Then I used this shooter as part of this new Baseball Game for NXT 2.0:
Then I used this shooter as part of this new Baseball Game for NXT 2.0: