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Like a mashup? I have always used Google maps for this sort of thing. I have never used Bing Maps but heard great things...

Thanks folks - that's exactly what I was looking for, both much appreciated. I've dropped their web dev's a quick email now - fingers crossed I get a sensible reply! Cheers & thanks again James

are you able to generate a website diagram based off a sitemap.xml ?

That looks exactly like what I was after - thanks Matt.