The 8th international planning workshop on GPM has been held from 16 to 18 June 2009, in France, Paris. It was hosted by CNES and CNRS/IPSL, in the frame of the Megha-Tropiques mission. More than 110 participants have attended the meeting, from different countries and institutions (NASA, CNES, ISRO, JAXA, ECMWF, WMO, GEWEX, ..). All informations and presentations are available on the following web site: gpm.ipsl.polytechnique.fr