Solidworks is what we use at work (by we, I mean the engineers...) They have done some drawings of parts for the Jeep I have sketched up, and created prints from their 3d models to give to the metal shop for fabrication. They do some very elaborate design stuff with it including laser/ion optics modeling. We make Atom Probes!

They have told me they would teach me how to use it, but we're too busy right now.