design

Ah, that magical mental phenomenon that allows us to create anything in the first place. Nobody knows how it really works, or do they?

drafting
CAD
FEA, solid modeling, and simulations

Links:

What can I say, I'm a fan of Alexander Slocum and his work. Lecture notes from a class he teaches:
http://pergatory.mit.edu/2.007/lectures/lectures.html

I find that the best way to learn is to see an example. Example calculations, and tips for how to think like an engineer:
http://pergatory.mit.edu/2.007/Resources/index.html#calculations

A good example of what an engineer goes through in designing a prototype part. This part is to be used as a spindle for a CNC_mill. Well written, and contains some good ideas that I plan on stealing.
http://pergatory.mit.edu/rcortesi/portf/spindle/spindle.html

Same engineer, this document describes a milling machine based on his new machine tool way technology. Can be used with viscoelastic damping technology.
http://pergatory.mit.edu/rcortesi/portf/axtrusion/pdffiles/Axtrusion_Ch2.pdf