The Pacemaker app, a DJ application that was developed exclusively for the BlackBerry PlayBook, is now available for purchase in App World. The application has been shown off many times over the past few months by RIM and Pacemaker Music. This app allows you to use nothing but your PlayBook and some speakers to become a world-class DJ. Pacemaker allows you to create mixes using a wide array of effects, equalizers, and other tools, which can then be played back via headphones or a sound system. Pacemaker is available in App World for $14.99. There is also a Lite version available for just $4.99.