  The evolution and the present status of the gaseous photon detectors
technologies are reviewed. The most recent developments in several branches of
the field are described, in particular the installation and commissioning of
the first large area MPGD-based detectors of single photons on COMPASS RICH-1.
Investigation of novel detector architectures, different materials and various
applications are reported, and the quest for visible light gaseous photon
detectors is discussed. The progress on the use of gaseous photon detector
related techniques in the field of cryogenic applications and gaseous or liquid
scintillation imaging are presented.
