Recent research is reviewed in which Positron Annihilation Induced Auger Electron Spectroscopy (PAES) has been utilized in 1. studies of hydrogen adsorption on Si, 2. studies indicating trapping of positrons on Au nano-structures formed on a Cu substrate and 3. measurements of the relative annihilation rate of surface trapped positrons with core levels of Ga and As on a GaAs(100) surface.