Am I right in assuming that Gravity Probe B has proved that the rotation of the earth (@~465metres /sec.) 'swirls' space-time in the same sort of way that a rotating ball will swirl a fluid? I ask because if this is the case, then the forward motion of the earth (@~360km/sec.) must also produce a linear dragging which is detectable, much like a speedboat leaves a wake in it's path. Also, if the rotating mass of the earth causes frame dragging then common sense insists that matter must also 'displace' space time in a manner similar to Archimedes principle.