Something I started doing recently and thought it might be helpful to others (or its just common sense and I'm a little slow).
I use cardstock for almost everything and the problem with creating a deck of 60+ cards is that they stick together very badly initially. I found that by rubbing the entire sheet of paper on my desk before cutting makes them easy to handle right away without shuffling through many times to get them smooth.
I'd be interested in hearing tips/techniques that others use when creating prototypes.