On my Google Earth, I've marked about 100 or 150 parks, I think... all the way from South America to Asia. Unfortunately, I'm not sure you can export from Google Earth to Google Maps. If you can, let me know, and I can give you all the ones I've marked.
Since he have been having trouble with the hosting before then to solve that it's now available on the European Coaster Club web page in their library section, it should be much more stable over there and easier for him to update.
I actually got him to email it to me a week or so ago...How awesome is it! You can even set it to show all those Weigand toboggan runs, and water parks (Both side interests for me)
Coaster wise, it is incredibly comprehensive, though with some countries it makes it a huge field of pins....Is there any way to filter it so you only show the larger pins representing parks with more coasters?