The Christmas eve game is Civ IV Complete (original game + 2 expansions + Colonization) for $19.99 (50% off). This is a great buy, but again Impulse is a little late. D2D has already done this and Steam currently it on sale. I can't remember the price on Impulse, but this is a little cheaper than Steam.
This one a day approach by Impulse and D2D may be great for getting views on their site, but I don't see how it helps sales when people like me really just look at the ones on special and when other sites are having the same games sooner.
The comprehensive Steam sale really blows them out of the water, but I wish Steam had done it sooner.