I went by Gap today, and here's the deal at my Gap (NYC):
Today is the last day for $30 off $100, even though it's supposed to go through the 24th. Tomorrow, the sales clerk told me very quietly, they start doing 25% additional off sale items and 50% off outerwear.
They also gave me a card today for 40% off one full-priced item that's good only in stores on 3 Wednesdays in December.