I just stumbled on the "Mapping Keep on the Shadowfell" series of blogs at The Gamer Dome. It's a five part run of blogs that shows how the writer took the paper grid maps from H1 - Keep on the Shadowfell -- and turned them into full terrain.

Even if you have no intent to run the module, this is a very impressive (and picture laden) series of blogs.

Mapping Keep on the Shadowfell -- Part One
Mapping Keep on the Shadowfell -- Part Two
Mapping Keep on the Shadowfell -- Part Three
Mapping Keep on the Shadowfell -- Part Four
Mapping Keep on the Shadowfell -- Part Five

I wish I had that kind of time and skill!