For fans of the more obscure Angkor era temples, a lot are mapped starting around here, http://bit.ly/9nsBpv , with a lot of panning the map around.
The locations are generally taken from Ancient Angkor by Freeman and Jacques, Asia Books, Bangkok 1999. You more or less have to know the names to find them with search. The comprehensive on line listings of the names with geo-locations seems to have disappeared
but here is a site with a lot of photos with locations. http://www.panoramio.com/user/1549852/tags/Cambodia