Terrastruct is an app for creating terrain maps out of mesh's.
Its a fairly simple process that just about anybody can do, but the thing is we have the ability to import mesh's, so there's really no need to import the extraneous data, or create the events for it.
I'm still in the planning process, and the first part of the engine is made.
Included in the zip you'll find a mesh, and an exe that loads it. This is an example of a map with detail that's fairly high, but it's just a taste of what can be made with the process.
http://dl.getdropbox.com/u/666516/tsdemo.zip