Its marketing not entertainment
Why is this ad such a problem... we should be glad that the thirst for novelty seen here isn't reflected in apple's marketing strategy. The ad uses the same style because it is obviously intended to reinforce the same idea about the same product. It seeks to expand the customer base not introduce something revolutionary... with this in mind the ad is effective, it is fun, it is lively, it communicates what the buzz about the ipod is all about!
True, like many here I would like to see apple expand its marketing into new areas, i.e. imac and tiger, but it seems that for now they will stick with what they are dominant in: the ipod market! Think about, as bad as it may seem that they don't advertise in other areas, it would be disastrous if they started loosing their share in the mp3 market, and it seems like they are focused in not letting this happen...