Not sure it can be called a conspiracy though, as it's not exactly a secret. It goes into products that are 'made to fail' as well as other ways of creating obsolescence, such as want creation.
Parts of this documentary are in German, French and Spanish. If anyone has a link with English subtitles, please post!
A sidenote, this made me laugh: Wealthy Chinese consumers own 4.4 luxury watches on average... http://www.bloomberg.com/news/2011-05-19/richemont-profit-surges-as-chinese-buy-more-cartier-watches-1-.html