Today on the LinkedIn AIGA group someone brought up the mistake of using a quote mark when trying to write the feet/inches symbol (called a prime mark). It sparked a huge discussion (or rant) on punctuation, or lack thereof, in the design field. To sum up:

Curly quote: ’ (used in speech)
Apostrophe: ‘ (used to show possession)
Prime mark: ′ (used to show feet, a double prime shows inches)
Acute accent mark: ´ (used in modern languages)

Hyphen: – (used in compound words)
En dash: – (used to replace “to” or an em dash)
Em dash: — (used to replace parentheses)
Ellipsis: … (written with <option> colon on the Mac or Alt-0133 on the PC – NOT written using three periods)

Hanging indents: Use them.