I am currently testing through my own scenarios and heightmaps. And I will upload them with the game itself so you can download the whole thing. Just unzip the file, doubleclick or make a shortcut to the openttd.exe and play.

I will place my files here: download.openttd-hq.net

For the forumthread:
http://www.tt-forums.net/viewtopic.php?f=29&t=27052