Though the idea seemed sort of ridiculous when we first heard about it, New Potato Technologies' new Jackpot Slots ($40) actually turns out to be smarter than it could have been. New Potato sells a plastic iPhone- and iPod touch-agnostic charging and syncing dock that looks like a plain black plastic cradle mixed with a one-armed bandit, plus a detachable USB cable for connection to the dock and your computer. Once you plug the iPod or iPhone in,…