Greg posted an update of his GhettOCAD app for the iPad. It's at
http://www.catchingfeatures.com/ghettocad.
This is a major update, with some features completely redone (e.g., the way GC georeferences maps), and some very nice new features added (a useful–and cool--google maps layer, distance and direction feature, wireframe mode, and many others). Very nice.
Thanks Greg!