I've been thinking about the same thing lately. Small pocket pairs are "big pot" hands. I don't want them to fold but I want the pot be as big as possible when I hit my set. Therefore I generally like to raise it to $1 as a sweetener when the blinds are tight, $1.5 when I'm not sure and to $2 when they're loose.

EDIT: oops. I was talking about a situation where you are the button and are folded to. In this case I'd raise it to $1.5 to get odds for the set.