Since the changes made to the SL Mapping API to using the Google Map API, it is impossible to pinpoint where a postcard was taken on the interactive maps.
Previously, we were able to call the JavaScript function SLPoint(simName, regionX, regionY) to pinpoint the location on the map, as the postcards provide this information.
We now only have XYPoint(globalX, globalY) in the JavaScript Mapping API to locate positions.
If the postcards also provided the Global Coordinates of the location as well as the Sim Name and Region XY coordinates, as it currently does in the body of the message, and also in a hidden HTML tag in the source of the email, the sites which use the maps would become fully functional again.
eg: http://bloghud.com
which takes text only posts (which do provide global and region coordinates via LSL) and postcards, which now are unable to pinpoint the location on the map.