Until 12/17/08 at 11:59PM PST, you can score a 20% off discount on all Benefit Cosmetics purchases made through their website! Just enter promo code TWENTY08 during checkout. Great time to make those last-minute holiday purchases!
Click here to visit the Benefit Cosmetics Holiday Gift Guide

Word on the street is Borghese is running a one-day sale, where you can get 25% off of any purchase! (No minimum, and the discount is on your entire order!) Enter promo code LASTCHANCE during checkout for the discount. Sale is effective ONLY on December 16th, so get shopping!
I have to admit, I thought the MAC holiday collections were already a really great deal.