>I see a Graphical UI where a map of a country can be split up into regions and districts and "assets" and the user can click on a region and drill down (explode or zoom into that region) to see the districts in that region and then drill down into a selected district at which point in time they would then be able to zoom in on a district and see the assets in the area. It would be nice if they could then hover the mouse over a particular region/district/asset and get some summary info displayed about that region/district/area.
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>4. This is to be a web based UI, (running on an intranet, if that matters). I am still to determine what technologies the company uses currently for their intranet. There is the possibility of needing the system to run on smart phones.
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>or maybe javascript or PHP & PostgreSQL

for the front one of the JS toolkits (jQuery, Sencha, Dojo, QooxDoo - many more)
for the backend either Web2Py if you like python or
look for an also JS based backend based on Node.Js
(***very*** bleeding edge, but dev occurring by leaps and bounds)
data backend Postgres is correctly identified IMHO

regards

thomas