I remember using a program like this a few years ago, it allowed you to create landscapes from fractals like this program. It was really cool, I may just have to have a play with this one, is the download fully features, or do you have to pay?
edit - I think Google has gone mad!!! I was looking at its 'similar pages' feature for Teragen, trying to remember what the old program was called I used to use and it has some very weird entry's, some of them of an adult nature 