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I love Transport Tycoon
Here's another tutorial that uses a different means of locating the data without needing Google Earth. Probably works better if you want a heightmap of land in the U.S.
Also, a nice alternative to MICRODEM (I couldn't get it to work on x64 Windows 7) is called
dlgv32 Pro. While it doesn't let you save your loaded map as a PNG (or save at all for that matter) it's easy to just screen-capture the map and paste it into your graphics editor, once you switch the display to 'Gradient' and turn off the 3d shadow effect.