The fall of Gaddafi in Libya will lower price expectations for oil prices further. Libyan oil is "sweet" and accessible. Remember that when the civil war began six months ago, prices rose. What goes up, must come down.
Libya's revolution is bad news for Assad in Syria (see below), but it also is bound to be unwelcome in Venezuela, where free-spending anti-Western Hugo Chavez is wobbly, and in Iran, where the mullahs need oil money to still criticism from the masses. Less money equals less support.
In America and Europe, lower oil prices will assist economic recovery more than any government "stimulus" one can think of.