FYI: Interesting recent views and lists of papers on the Quasar-Jupiter effects observations, also gravity measurement concepts in general from Washington Uni...
http://wugrav.wustl.edu/people/CMW/SpeedofGravity.html
Also this might be of interest
http://lisa.nasa.gov/ a giant orbiting Michelson Interferometer experiment planned by NASA and ESA. Video here:
http://www.lisa.aei-hannover.de/?pag...b=lisa&lang=en