Normally there is only one Xbox 360 Deal of the Week and it may or may not be for an Xbox Live Arcade game. This week, possibly in honor of Black Friday, there are three deals and two of them are on games.
The first deal is for the Fable II add-on, See the Future. For this week only, it sells for 400 Microsoft Points ($5), a 29% discount. The second deal is for the action puzzle game, Peggle. You can get it for 400 MSP ($5), a 50% discount. The last deal and second game on sale is Death Tank which can be bought for only 800 MSP ($10), 33% off.
As always, the Deal of the Week only applies to Xbox Live Gold members.