Some very unfortunate news, I have been asked to remove SuperPong 2 from the App Store at the request of Atari Interactive due to infringements against the pong and breakout copyrights.
Student developer Noah Witherspoon ran across a similar issue when his popular Tris game had to be pulled due to a copyright claim made by the Tetris company.
In the case of Witherspoon and Spiffyware, both are student developers who do not have the resources to mount a legal battle, and they have both expressed some doubts about the legal scope of these demands.
Update: Gyrocade's 3D Vector Pong [App Store] has also been contacted by Atari. The developer's solution appears to simply be renaming 3D Vector Pong to 3D Vector Ball. Though no official response from Atari has yet acknowledged this change as sufficient.