Look, it takes me about 5 minutes to do an awesome, perfect Photoshop drawing that's dimensionally accurate. I've tried to learn Sketchup, various CAD software and the BigBlueSaw tool, and there's some major disconnect in my head about it... I have, though, seen a few utilities that claim to take a .pdf format, or even a .jpg or .tif format file and convert it to a .dwg file.
Anybody have any experience with this kind of thing? Can you suggest a utility to do it? Even more off-beat, how about on a Mac platform? (I run WinXP too on this thing, but a native Mac app would be awesome.