I first used Terragen when I was studying digital art at university. Terragen is a landscape generator that creates wonderful images, one of which used to be the header on this site.
After a couple of months of using it the developer stopped work because he got a job at a major movie special effects company (that I can’t remember the name of – it was someone like Digital Domain).
Anyway now that his contract is up he’s hard at work on Terragen 2 and today I saw some renders from a preview release of the new version.
The big new features (apart from looking stunning) are the vegetation and other scenery objects. It looks stunning.