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Multiplayer pong made with redstone only, no mods. Fast ball movement and support for multiple balls (3 at most probably to prevent burnout.) Mostly reliable, should be suitable for SMP. See the link for build tutorial.
There have been a few posts about the left and right side being different. To clarify, this is just for demo purposes. They can be swapped for either type (Return-to-Center or Hold-postion) by using a program such as MCEdit or the WorldEdit mod to mirror the desired type. Failing that, they modular and simple to build by hand.