It can use some work, but it has done some nice jobs for me already. It expands on the idea that was posed here: http://www.stevetrefethen.com/blog/UsingGoogleMapsFromVCLSampleApplication.aspx
I've put a demo executable and sourcecode online here: http://www.xs4all.nl/~niff/GoogleMaps.zip
On this screenshot I've switched to the Google Earth view:
Here are a few examples of how you can use it:
It doesn't intend to wrap the full API; it's just to make life easier when dealing with Google maps. The unit DouglasPeuckers is not really needed. It's used to simplify a polygon when you run out of resources.
Good luck, and let me know if you've created something useful with it.
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A quick Google search on "Google maps delphi" turned up 10+ pages of hits. Among the top 3 was Using Google Maps from a VCL Sample Application