You may not have heard of a transducer before but they could be a worthy addition to any home cinema setup. In essence they are nothing more than a subwoofer with the paper cone removed, and a metal bar added. When the subwoofer is stimulated by low frequencies it causes the metal bar to move up and down causing vibrations.
They are used extensivley in high end home cinema setups and, as in this version, for DIY simulators to simulate the vibration you would normally feel when flying a plane. Check out the DIY sim site at http://simprojects.nl/transducer_construction.htm to find out more about how to construct a DIY Tactile Transducer