Preah Vihear with Political Map

This article from The Mirror includes a map from the Joint (Thai, Cambodian, UNESCO) Communique 

Buddhist Temples of Ancient Pagan, Burma / Myanmar

Resolution of the plain near Pagan, Burma / Myanmar is improving enough to map some of the 3,000+ Buddhist temples using Google Map Maker, OpenStreetMap, Wikimapia.

Here's a GMM partial view of the region with some of the sites mapped.  The Panoramio photos of this area are generally poorly geo-located, but here's a view.

Pierre Pichard did an 8 volume inventory of the monuments for UNESCO, which apparently aren't available online except in snippet form.  The inventory includes lat/lon of each site to 3 decimal places.  I don't know how the surveying was done.

Angkor Temples Mapped

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
http://www.angkorguide.de/English-Dateien/monuments.htm
but here is a site with a lot of photos with locations. http://www.panoramio.com/user/1549852/tags/Cambodia