As I understand it, Einstein didn’t say that nothing can go faster than light but that we simply can’t measure any speed greater than light. There is no inertial frame from which to take such a measurement.
‘non-inertial’ frame
No he was pretty explicit that you can’t beat the speed of light, BUT where the leeway lives in defining the speed of light to your object AND the space around it. NASA’s got a lot of stuff about it, the thing to always keep in mind is that it’s about space-time, not just time.
http://www.nasa.gov/centers/glenn/technology/warp/warpstat_prt.htm