Whose and who's

The problem here is similar to that of it's and its, in that whose is possessive.

Who's is really who is, the apostrophe indicates that an i is missing:
e.g. "Who's that gorgeous girl over there?"

Whose means "belonging to the person":
e.g. "Dan, whose eyes were bloodshot, hadn't slept well."

Whose is a possessive pronoun.
e.g. whose cat, whose iPod, etc.

Who's is normally misused in questions such as:
"Who's bag is this?"

It should, of course, be "Whose bag is this?"

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