The next 2 DOTW on Xbox LIVE are:

Week of July 26: Borderlands Add-Ons

Secret Armory, 400 Microsoft Points
Zombie Island, 400 Microsoft Points
The Underdome, 400 Microsoft Points

Normally 800 points each saving 50%

Xbox LIVE Marketplace | Borderlands
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Week of August 2: Forza 3 Cars and Track Packs

AutoWeek Car Show Pack, 240 Microsoft Points
Hot Holidays Car Pack, 240 Microsoft Points
Jalopnik Car Pack, 240 Microsoft Points
Nürburgring GP Track Pack, 240 Microsoft Points
The Road & Track Car Pack, 240 Microsoft Points

Xbox LIVE Marketplace | Forza Motorsport 3
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The Borderlands ones are well worth a look, I’ll be purchasing Zombie Island and Secret Armoury for when I finally get round to playing the darn thing.