The first virtual world that allows direct and reliable importation of .dwg, .dxf (AutoCAD) files, .blend (Blender), and Google Sketchup files for player content will win in my opinion and I have yet to see that happen. Also a standalone editor is needed, I can't afford to be logged into the world and therefore lagged all the time in order to do work.

I'm not asking even for a straight importation, make a standalone converter that uses .igs or something. Just let me use industry standard CAD tools to make items and structures.