I’m teaching databases in a computer science department of a small university of applied sciences. I'm a partner at the Institute for Software. I introduced Postgres in the Bachelor studies. And I’m also offering courses about PostGIS/Postgres. I was e.g. co-organizator of a Postgres booth at the FrOSCamp 2010 at ETH Zurich. As a showcase of the capabilities of PostGIS have a look at OpenStreetMap-in-a-box (http://dev.ifs.hsr.ch/osminabox/ ).