I know you're inundated with the millions of sales coming up this weekend. If you're interested in taking part, I found Temptalia's list to be the most comprehensive. Here are the ones I have taken/will be taking advantage of:
YSL: 20 percent off now through 11/26 with code CYBER. If you wait till Cyber Monday, 20 percent off with code MONDAY with free gift when you spend over $100. Free shipping on all orders.
Shu Uemura: 20 percent off with code WISH2011 now through 11/29. Free shipping on orders over $50.
Best thing about online shopping - no lines!