Color Code Map based on addresses

I have a list of approximately 500 addresses, mostly in the USA but some in other countries. I am looking to make a nice looking map that's either color coded or maybe has "peaks" like mountains, showing where the addresses are, indicate areas that there is heavy concentration of addresses, etc. Kind of like the graphs you see in magazines. ## Deliverables The deliverable will be a few images with the output of the addresses that i provide. the addresses are our customers. i want a nice image showing where our customers are located, like i said maybe color coding certain regions where there are lots of customers, maybe with "mountains" showing on a 3D image, soemthing like that. i assume there are ways to do this either with Google Maps or MS Mappoint, but i'm not sure. I will provide the list of addresses in Excel format, you'll be responsible for geocoding them (if necessary) and creating the images/graphs.