I put up a gallery of the CAD drawings I've done since I got Rhino 3D last Christmas:
http://www.thewarfields.com/MTCNCRhinoPen.htm
I don't know what I'd do without the silly thing at this point! Hopefully the gallery will give you an idea what you can do with a program like this. I am no great artist, but as you can see it is pretty versatile for either mechanical-type drawings or things with more flowing curves. I'm the only one that ever uses these "prints", so I don't bother with too many dimensions and such.
You can see my crude design for a CCMT fly cutter on an R8 shank at the bottom. It's the latest thing I'm fooling with. Ultimately, I intend to convert my machines to CNC and feed 'em this stuff directly. I'm probably 70% done converting my lathe.
Enjoy,
BW