Most Useful Non-Nursing Course(s)

As a male nurse I'd say my 'Psychology of Women' class has been the most useful.

I would have to agree with a lot of the ones repeated already.
Typing class (mine was done in high school),
Computer classes to be at least proficient on the computer. Depending on your position...Excel for scheduling and accounting (my first undergrad is in accounting/management). Spanish, and any other language that fits the population of your organization.
Anything that helps!