[RWood]

Speaking of DRM content and new machines, MicroSoft is introducing a new player this year that is not compatible with their old "Plays For Sure" format. Thus all the people who bought DRM music must now buy it again.

Edit: Mobi may well still be available for other readers to implement. Amazon is in the business of selling content, the more readers that can use Mobi, the more content they can sell. It will be a matter of implementing uniform DRM restrictions more than anything else. Apple on the other hand is in the hardware business and maintains iTunes as a service and a selling point for the iPod, it is not their main line business.