Promotions in a down economy. What works and what does not

Adage has a list of promotions that are being launched by various retail and food chains to drive purchases in this tough economy. The one that I like best is Campbell/Kraft because it ties in 2 products and it promotes cost saving without sounding desperate. All the other promos seem like "me too" (esp. the food chains) and do not do anything to cross promote their portfolio like the Campbell ad does.