I'm looking for famous companies / "big names" (like army , goverments , city halls) that chose to use open source map servers and not paid solution like ESRI and such for presentation I'm doing (go Open Source :) )
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I work for Ordnance Survey, Great Britain's National Mapping Agency, and we use GeoServer for our web Map Service, OS OnDemand.
We also use PostgreSQL and PostGIS to store our vector data.
A famous name in education would be Harvard University using QGIS: http://maps.cga.harvard.edu/qgis/wkshop/ui.php