The spin distribution of accreting millisecond pulsars cuts off sharply above 730 Hz, well below the centrifugal break-up limit for neutron stars. A variety of braking mechanisms may contribute, including magnetic accretion torques, magnetic dipole spin-down, and even gravitational radiation from the rapidly spinning star. I will discuss this area, as well as other recent highlights from x-ray timing of compact stars. I will also review future scientific opportunities in x-ray timing in the post-RXTE era about to begin, including ASTROSAT, LOFT, and AXTAR.