To riff off of Slacer's title, I'm looking for a good terrain generation tool and workflow. I've scoured the forums (in part, thanks to A7oogle -- http://www.dejobaan.net/3DGS/a7oogle/), and have tried many of the suggestions (OB's guide helps), but wanted to know what folks were using recently?

My goal is to build "large," attractive terrains with baked-in shadowing.

Thanks!