January 14 - 11:15am EST   Amazon and Pepsi this morning claimed a changing of the guard with word of Pepsi Stuff, a new promotional campaign bent on accomplishing for Amazon what 2004's iTunes promo did for Apple. Rather than hide complete giveaway codes under random bottle caps as with the iTunes campaign, the new promo guarantees songs based on the number of drinks: buyers instead claim points from each bottle that go towards free items. Five bottles are enough to qualify for a single song. Since every song comes in the unprotected and more universal MP3 format, nearly every user of a portable media player can claim the rewards from the campaign -- including iPhone and iPod owners, Amazon ... [full story]